Your aurora suggestion is to buff speed and remove hover, that's literally making them move to every other type of tank.
Yes, corsairs on mexes. 1250 damage a corsair on 2k hp max for a mex. If you get real bad RNG you might need 3. Reminds me that another thing corsair and notha are great for are sniping tmds, janus sucks at that.
5 range on ACU = percy and brick can't do anything against Aeon ACU. Neither will your own ACU. If it cost as much as normal gun you would still get it late t1 or early t2 every game because it's a stupid increase in ACU utility.
Frig is still powerful on big maps. Again, they provide radar. Big map = larger chaotic period = need more units to protect the map = frigs have more odds to sneak around and do damage to BP whether expanding or at navy facs. In turn, the radar enables you to secure your own side better since you have intel.
I addressed a way to make UEF work better in my own thread, mainly making cooper into a slow sniper style unit that does passive damage while the destro works as the low range brawler. Shield and cruiser are pretty self evident in role.
Cybran BS is closer to Aeon BS, it trades some speed and dps for more range. Never heard anyone call it bad. Just a mid tier BS in terms of utility.
Yes you checked out carrier AA for mass, good job. Now check out the HP for mass and the range.
Salem buff was needed cuz salem is trash. My example is proving salem is trash, that's the relevancy. They were always considered the worst destroyer since forever. Generally, you buff the worst thing. Aeon destro is still strong, losing the range just made it that the Aeon player cant just right click the navy to win the game anymore. Or kill BCs mass efficiently.