I don't mind the update but I think you missed one of the biggest problems, that of the chainsaw. The hacksaw and cobra didn't really need nerfs imho unless you were doing it preemptively to deal with the now weaker bombers.
Think about it, every turret has a specific role right?
LLT- light point defence
Defender- superlight aa and kills scouts
Stardust- riot anti spam
Faraday- emp and riot
HLT- Anti heavy and assault
Gauss- frontline artillery resistant point defence
Pene-anti strider (which it doesn't really do due to rediculous range)
DDM- medium range fortress
Hacksaw- anti bomber
Razor- front-line artillery resistant aa
Cobra- Anti-gunship and late game air spam
Screamer- AA artillery/ air area denial
So where does chainsaw fit in?
Chainsaw is long range like mini screamer, at a third the price.
Chainsaw has rapid rof so it can deal with swarms of weak units.
Chainsaw has high dps so it can deal with heavier air units.
What is the chainsaw's role? It doesn't really have one other than pwning all air as far as I can tell. I would remove it completely if I had a choice, to be honest.
Instead of chainsaw, buff cobra's aoe to specialize it and make it actually get built sometimes. It would work as a defence against things like avenger or gunship spam and dense clouds of bombers that hacksaw and screamer can't.
I'm a newby so take my opinion with a grain of salt though.