EDIT: I re-edited this entire post, it read like two monkeys sharing a keyboard to me. Gyeah.
Well, with a bit of beefing (3/4 turret cap on beach-head, 1/4 on homeworld, and opening up HBCs) and VERY careful usage of the Raids to not lose the entire fleet at once, I was able to take this down around 5:24 in.
Basically, with the reinforcement of the beach-head, they were able to handle most middlin' waves. With Siege and Leech on the beach-head, I simply would retreat any captured MK II ships back to the homeworld for a while. This becomes important later.
In the meanwhile, I'm doing guerrilla style fast raids with the Raid SSs, being very picky about my targets. The Tigers are the heavy lifters, with most of the fleet back on homeworld. I'd even send the tigers into AI Eye worlds to 'distract' so the the Raid SSs would have friendly fleet cover.
The Tiger assault team was streaming from behind the beach-head into enemy territory. This meant any time a wave went for the beach-head they'd immediately start supporting it. The longest the beach-head was without them helping to defend was 4 minutes, the lifespan of a Tiger.
Finally, I got down to the homeworlds. First target was the AI Eye HW. Most of the planet had previously died to Raid SS runs, but the Tigers were getting completely hosed up by a Laser guardian and fort with a grav guardian under the same FF while trying to finish neutering the CC defenses, which stalled out the stream so they basically floated into a one shot - death scenario as the BEST case, usually the died before they could shoot.
This wasn't going as planned, so I brought in the Raids, snuck them as close as possible to the grav and as far as possible from the Beam/Fortress, and they slow drove in and eventually popped it. I lost four Raids but they escaped and that ended the last concern on the AI Eye homeworld, and the Tigers started clearing out the FFs and Fortress as well as another Fort hiding under a FF (popped the guardpost earlier).
That left the Raid Engine Homeworld, which I'd specifically left alone until the AI Eye world was utterly neutered, which took an hour or so with just Tigers and them also being heavily involved in defending as well. Finally I was able to redirect the swarm down towards the Raid Engine. This was going to take some timing. When the Swarm hit coreworld and activated the Raid Engine, the Raid SSs booked it for the AI HW and the Raid Engine from one planet away. No matter what it cost that Engine HAD to come down. It came down pretty cheaply, all told. Lost 3 Raids to the Mass Driver, another 3 to the local starship population, but it went down and the Raids ran for home. So far, so good.
Eventually I'm able to stop the Raid + wave and the beach-head didn't look TOO bad, even though AIP was around 52 at this point. Now, I had to deal with those 3 Beam Posts again, which basically completely wasted me last time.
New strategy; try the SSBs again with a 'divide and conquer' method. Low and behold, they work just fine if you micro them in a circle around the beam post and then have them power up and uncloak just as they're about to attack. Usually lost about 4/12 of them, if nothing else got involved... however, the first time they got pretty heavily abused by local defenders and
just missed killing it. Round two went like a dream.
That's one beam post down, but a LOT of starship defenders are screwing up the Tiger stream. The Raids can help now that the Mass Driver is down from SSB attacks, though. Send the Raids in and park them in open space, and let them chew up the starships for a while. 4 Spire Starships, 2 Zenith, and 3 Bomber IVs later, I've lost 10 Raid SSs or so. They head home for now. SSBs come back out to play and hunt down the Ions and a few random posts. Eventually, I need to deal with the final two Beam posts.
One's under glass, but no grav this time, the other one is nearby that one and they're supporting each other with firepower. While using the SSBs to tackle other posts in the system, the Tigers sweep in near the unprotected one. Well, that works. The SSBs high tail it (as fast as anything at 56 KPH can go) and come in from the other side, where they were recently abusing a nearby post. It cost me nearly the entire fleet of SSBs, but we took it down in one go.
Only the last Beam Post to go, and at 70 AIP, the waves are being far too small and quiet for my own taste. The Raids rebuilt, I bring them to the AI HW and manually position 27 Raids in a huge circle around the last post... all attacking at once from diff directions so it couldn't mop the floors with the entire fleet in two or three bursts. I lost 7 Raids, including a few IIIs, but worth it. That's another one in a single attempt. Rock. On.
Now, it's just a matter of patience. Send the Raids home and get them some R&R and some cloaker SSs to support them parking in the AI HW that we neutered earlier. The Tigers start work on the double FF/Fortress for the last command center with some Bomber SS support that didn't last too long due to local guardians.
It was slow work, just a lot of twiddle while they work the FFs. Eventually they get through it but then the waves hit while the Tigers are whittling the Cmd Center down and the Raid/Cloakers are prepped for the kill on the AI HW. At about 2/3s a 3000 ship wave MK II and 750 or so MK V double-wave. Raid/Cloaks head home, I stop the Tigers from continuing to attack the Cmd Center. I order the entire main fleet out to the beach-head to support the defense, as well, including all the stolen ships. This is what I protected them for.
2000 of the MK II wave spawned up on the beach-head directly. It worked out very nicer than I'd expected. Just as the fleet finishes killing off that portion of the wave with massive turret support, the next wave starts coming in. Also, my Raid/Cloak unit is still hiding at my homeworld, with the Raids powered down, waiting to be able to go. I don't want to make a mistake (or have the HW reinforce for no reason), and want to make sure the Tigers will get the kill before the Raids get the other one.
Eventually, we dig through the mess that assaulted the beach-head with surprisingly little difficulty, just time. I lost a good chunk of my MK II captures but still had 50/52 E-Shuttles left, which were all stolen anyway.
With the tigers on final approach I wait for them to get there (they're abusing some local FFs that I'd raided the posts out from under) and send the Raid/Cloak unit down to the other homeworld, positioning them for a final strike when I'm ready. The Tigers whomp one Cmd Center. BOOM. The Raids are quickly powered up and slam the other Cmd Center. 3 Salvos.
BOOOM
Bye core. Bye grav. And that takes care of the 10 planet achievement as well.
That'll probably be my last game
without CSGs on. It's really an 'easy mode' button if you turn them off.