recon fighter will slow down the interceptors. dump the thermal, and maybe the ecm. If you can, increase the range of the sensor system.
You can still squeeze some weight out of these fighters. judging by the MSP you are using something larger than a single Fighter Engineering SPace - unnecssary. The long range on these fighters is much better, but perhaps unnecessary to have on every variant; that pretty much comes down to doctrine.
I do note that the tracking speed on the starfighter tracking system is very low, possibly indicating very low tracking speed tech. Given that you have fusion drives, it would be pretty easy to upgrade your beam fire control tech so you get at least 16k km/s tracking. If you want, you could also save some weight by reducing the range a little.
I'd really like to know what you are putting on these things that takes 200+ msp to repair though... O_o It might be whats driving up the cost so high... Ion drive fighters (my usual fare) run about 40-70 bp.
Speaking of doctrine, you should really visualize and figure out what exactly you want each of these ships to do and how that will fit into your doctrine. Then rework them with that doctrine in mind. If these were my ships, I'd do it this way.. The Interceptors are long range strike craft, ideally striking from outside the range of enemy sensors; they could sacrifice some speed for firepower and fuel if need be. The MiG-49s look like close range task force defence boats, for shooting missiles and fighters; I would set them up with minimum weight (no fuel, engineering, etc), maximum speed (for better tracking) and sophisticated targeting systems. And the SU-150MI .. is a Joint strike fighter kludge. Heh! I am a bit worried about that one. It is super expensive and looks like it mounts more tonnage of electronics than anything else. A Res1 100km range FC is expensive on a chassis that size, and you also have a beam FC on there. In one of my campaigns I do have a beam/missile fighter, but its designed to only need to be slightly faster than starships in close-range strike scenarios. It uses a completely minimum-size missile FC. To be fair, thats less workable on anti-fighter duty, but here's the thing about anti-fighter duty... its much harder to see fighters coming than to shoot at them generally. What is going to spot the enemy fighters for the Su-150MI to go to work? Certainly its not going to be the carrier or the recon fighter.