I haven't tried the Quadratic AI type yet, so no comment on it particularly.
"All minor factions set to 10/10"
All I can say is
you asked for it. You stacked the deck against you in a very nasty way there. A very nasty way (off the top of my head are 4 Exos, auto AIP, cookie monster, DS, enclaves, and wardens). 1130 AIP is also going to hurt (a lot). Ok, so yeah, warheads.
However I can still argue that AIP from warheads aren't the issue here, the lobby options are
.
Last thing, aren't non-planet killing warheads damage capped? That stat
is tied to cap scale (90% sure on that).
@LoN: In multi HW games you also have larger caps of defensive assets. More turrets, forts, and shields. If you know you need more presence to defend against heavy hits, it is there to be used. Also, if I'm not mistaken, AIP doesn't scale linearly with number of homeworlds. In a 4 HW game, 1 AIP does not equal 4 AIP (vs a single HW game). Pretty sure on that too, though Keith could probably clear that up quickly (you can also math it out from the logs if you enable them).