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Maybe it would be more easy to balance it, by having defenders already present at forward bases on each line, and some strong building/fortification/turret to be destroyed in the back, with a lot of hp. Also each base should have defense bots removed ( this would also improve balance that is way too broken now, with attacker being overwhelmed ) and maybe  capturing each sector by destroying all buildings ( that should be significantly stronger , with many armored parts, so GAA and bombers to be necesarely ).Maps should be bigger, why not with 9 sectors like frontline.Queue times should be increased to gather more humans in battles, with teams of 30 v 30 ( if fronline kind of map ) , or 15 v 15 if regular map.

I cant say that i won Attacker or Defender more often. It was always the better players which won...except a few battles...i have the feeling it was similar, no matter which side, just somnetimes i had the wrong airplane

If you have large teams and larger queue times, people generally don't like waiting, you'd end up with more bots, just quick glance at your suggestion. 

 

The rest sounds good, would/could very quickly become imbalanced again without ADA and people forced to focus GAA or attacking fighters.