I like in-depth simulations, but if you'd asked me how the hell the fleet cap worked before 0.7, I couldn't have explained it to you. So I feel that the simulation has shed some weight in the right places. But yeah, fighter fleets could use the extra slots.
Although now that combat officers are in the game, it feels as though the whole metagame has consolidated fleets towards the middle. You need enough non-fighter slots to occupy 10 officers or you won't be competitive against an enemy fleet that does. That leaves you with 14 slots for fighters which can easily be covered by 3 flight decks total, sometimes 2. I've made this point before, but let me put it more succinctly: The Astral is now the relic of a dead playstyle. You can still use it of course and it's quite a good tank, but its main selling point are 6 decks.
I just had this weird idea... Fighter squadrons used to use hangars for travel. They got axed, right? But the idea behind this is still sound. Why not lower the fleet maximum to 15 or 20 slots, but add 4 slots for each flight deck that the fleet provides, to be used only for fighter craft?