I will keep my idea short.
I think that T2 navy and destroyers are an incredibly expensive and risky investment that currently can be negated too easily with enough frigates or torps or in case of aon destroyers even with T1 hover.
Since nerfing frigates seems to be not wanted, how about buffing T2 destroyers hp by 10-20%.
This would make it more enduring to torpedo attacks to give some response time for moving aa, allow for slightly better trades against hover and frigates and all the rest.
I just think that destroyers are just a tad too weak.
They should be more like:
"oh fuck I need T2 navy quickly now to deal with them"
"Oh this fool rushed an early destroyer? Let me just make half its mass worth of torps or hover or frigates to get rid of it."