Fleet points are used for autoresolving battles I think, so increasing that too much would make capitals more powerful on the campaign map than they really are in regular battles. As a result, you would have ai deploy smaller fleets (not necessarily smaller ships, a fleet comprised of, for example, 4 capitals and 1 cruiser would maybe roll 1 capital and 1 cruiser after your change) due to meeting their desired FP quicker, particularly nerfing those factions that use big ships agains the player. They would fare comparably on the map in autoresolve due to the big ships having more FP, but like I've said, in battle they would be the same, only now there would be just fewer of them. That would kind of break the balance of factions and make fighting some easier. I'm not sure if the ai considers the other values you mentioned when creating their fleets.