MMM.. proportions v3.0 sounds like fun
BTW: about fighters, they really are an overkill, the cost virtually nothing to own, and a squad of 50 fighters (easily carried on two destroyers) can destroy entire fleets, even if they have some PD.
I would love to see them soemwhat weekened in the next Version
Maybe you could specialize fighters, into three different types (interceptor, bomber, torpedo bomber) using the allowed target types of weapons.
May not really make fighters any weaker, but it'll certainly make them less universal.
ATM Fighters equipped with guns can tear apart just about anything