Super fortresses should get a particular nerf though, unless you have MK3 bombers or cut it off from supply its gonna be a long grind and you are fighting against its (fairly fast) regeneration as well. I played against fortress and Doorway AI and that was terrible, each planet had a fortress and black hole gen. Now one has a super fortress..
Also.. now that i heard that 5.021 is on the way, maybe the mobile repair station can get a little boost.. 60 seconds is too long (and i don't mean in enemy territory.. at least on friendly worlds, this delay should not exist or like, 6 seconds max.) I find that before my repair stations are deployed my engineers repaired everything before my fleet even GETS to the "mobile" repair station