Krow suffers badly from being able to be shot by absolutely everything. AA tends to be longer range and move quite fast so getting away without dying on only 16000hp is quite hard. If you use the dgun bombs then it slows down to the point it can't catch anything and the turnrate is awful.

I made a better krow in air impmod http://zero-k.info/Mods/Detail/15 even at 24000hp it is quite close to dying from a fairly small engagement. Something like this at say 4.5-5.5k metal would work quite well. Current krow is a bad joke lol.