From: Iowan in MD/DC
While I can understand the urge to maximize carrier airgroup size, I'd advise you don't get carried away.
Let's say you've upsized a carrier's groups to 115%, & all groups are wearing the max # of planes + 3 in reserve. That's fine, you're sailing out from port & looking for trouble. Problem is, carrier capacity includes active planes + repair/maintenence planes (reserve planes don't count against carrier capacity). After a combat phase, some few planes will need repair, & reserve planes will auto-transfer to the active category. So there's a real risk that a CV that sailed from port w/ an orange plane-load is now in the red, it's at a disadvantage until the damaged planes are repaired.
So I'd be careful, mebbe you could increase one of a CV's airgroups, to 105% of capacity (or more, if you expect that your airgroups will suffer heavy losses), but understand that CV airgroup overload isn't always advantageous.
In this situation, the extra planes would be pushed over the side, I think. It might take a day...
I go up to 110% for IJN. For the Allies, I don't bother until the VBF units arrive in 1945 - 90 planes is plenty.
Also in my experience, you can't resize to 110% total capacity and pull 3 reserves into each unit. For example, my size-63 CVs have a total group size of 70, but I can only pull 6 planes into reserve not the full 9, or not even up to the 8 that I thought I should be able to do (115% = 72.45, or 72 planes, and reserves count at 1/4). I'm not concerned about damaged planes causing those in reserve to be pulled out, as damaged planes means I had a battle and I definitely lost at least one plane. IJN planes aren't exactly known for being sturdy .