Your missiles are different sizes, this could cause logistics problems.
The passive sensors are probably not needed. Either the DSTS of the planet you are defending or the fleet sensors any carrier group should be carrying should be sufficient.
You don't need a hangar for FACs stationed around a planet, only fighters.
Your engines appear to be using thermal reduction. Useful for scouting potentially hostile systems with passive sensors, not so much for defending populated systems using active sensors.
You should match the ECM on your frigates.
Your missile salvo size is large.
Your warhead size is not optimised.
Agility may increase your chance to hit but speed is more important to avoid point defence.
The maintenance supplies on your FACs are lower than their maximum repair cost.
Nothing can be done about tracking speed at your current tech level, missiles are simply OP.
I'm not sure why you have mesons on your frigate rather than gauss cannons.