Yeah, 892 AIP is not where you want to be, even with -200% handicap on the AI, especially since it looks like you have almost everything enabled...
Fortunately for you, it isn't impossible. If you have a save about 10 minutes earlier, it won't even be difficult.
Start by reading
Kahuna's guide on building defenses. What you have isn't terrible, but it isn't as good as it could be - especially look at how tractors, Grav turrets, and minefields can be used.
Next, concentrate on fully enhancing and re-arranging your defenses on Fimurder, Quipsa, and Joshu. Build a warhead on each system (Joshu will probably want a Mk II or higher, the others should eb fine with a Mk I). Replace the Command Station in each system with a Mk III Military Station if it doesn't already have one.
If you have time, build more warheads in Joshu and Quipsa.
Give up on Usor; it's toast.
With that, I was able to survive the CPA and threat.
Other advice:
Go back through your old systems, and remove all the unneeded defenses. There's no reason for Chrki, Aiduokil, or Nuur to have lots of turrets. Delete them, and use the energy elsewhere. For that matter, delete most of your matter converters - they drain your economy, which can be better used on the frontlines.
Make Spirecraft. You have Spirecraft Hard enabled, but haven't built anything yet. That's quite a waste. There's some wonderful stuff available to you, like Martyrs! Basically, AIP-free warheads. Or Spire Transports, aka Cheese Machines.
Scout. Scout a lot. Find all the Data Centers, CoProcessors, and Civilian Leaders out there. The DCs and CPs can give you over 200 AIP reduction right now. The Civilian Leaders, well, find a few more you can capture, then kill the rest. Yes, it may seem heartless, but with that and some patience, you can drive the AIP down to 200-250, where you'll be more than strong enough to proceed.
Also, scout to find more Fabricators. Then hack them. You have a LOT of Hacking Points left. You can also use them to Knowledge raid (get K from AI systems) or Sabotage (such as in Marooryaq, with the Nuclear Eye).
Finally, combining the two, there's also the SuperTerminal, which can drive the AIP down another 100-150 points, if you don't want to wait on the Leaders to do it for you.
You have Fallen Spire enabled, and you're playing in a very Fallen Spire "In Your Face, AI!" manner, but you haven't actually started the Fallen Spire questline. This means you're missing out on all the wonderful goodies you could have. Try pursuing that for a while, with your strong defenses keeping you somewhat safe.
It would be a long, slow fight, but especially with the Fallen Spire support, you can do it.
However - I would recommend stopping this game, and restarting a new one. Play with fewer options - No Showdown, Exodian Blade, or Champions; and no Hard Golem/Spirecraft stuff. You can do the Fallen Spire, although I suggest holding that off till you already have a win or two under your belt, since it is a very different playstyle. Once you're more familiar with the game, come back to this game, or try the "everything!" game again.
Good luck!
