Don't you play against teleport turtles? When I started on AI-10, I considered playing against turtles or teleport turtles, but my strategy would be fairly trivial:
- Get a few planets (this is harder than it sounds)
- Defend the wormholes
- Nuke ALL other planets one by one.
If the enemy doesn't raid, it *was* quite irrelevant what their AI level is (the new fixes with raiding AIs may have changed this). Or am I, once again, totally mistaken?
I don't get raids, I just get sporadic troops sent through without warning. And they teleport. Pretty much all of them. Trust me, you don't want to get the AI progress up too much. A random sporadic troop collection of Tech II ships is reasonable, a random sporadic troop collection of around 100+ Tech IV/V ships (note: not a wave, just a random bunch wandering through), is somewhat harder to slice through. You tend to find your space docks don't exist after the first bamf.
Besides, I play F&D, so defending is actually much easier then Normal. Even more so now that The Developer Formerly Known As Not-X just bumped up the health, and stuff on pretty much every turret he could get his evil hands on. Whereas wormhole assaults are lethal (and even more so now with the damned electric turrets with even more health!), so therefore it makes sense to actually play to the difficulty curve.
#include <everything-x4000-said-here-as-well>
Except with the addendum that from memory the last Tech IV planet I wiped out actually had a pile of Tech V ships on it, about a third of them from memory, so even a Nuke wouldn't help much with that one.
EDIT: I should also add that's a cheap and nasty and awfully boring tactic anyway, even if it worked, so there's little point in my trying it.