Dude, if you're on an uber-grind then you should be staying out of 3-bet and 4-bet wars. Your a-game is likely to be a little absent, so just play new-school-TAGnit-ABC. Go for 14-11-3 (3 = %3-bet), with about 75% fold to 3-bet or something.

Hand 1 - AKs. 4-bet sizing in AK hand? nothing wrong with folding, shoving, or 4-betting to $10. All reads dependent. Once he raises the flop it should be apparent that you're fucked, you shouldn't be seeing a turn. His range is AA+. His call of the 4-bet is standard deep and in position.

Hand 2 - nh. 80-20 isn't 100-0, beats happen.

Hand 3 - Meh, i don't like the 4-bet. When you say for value, what do you mean? Value against his 3-bet-call/5-bet range? what you mean is that you're ahead of his 3-bet range, that doesn't make the 4-bet a value bet. You folding to a shove?

Hand 4 -
Quote Originally Posted by Micro2Macro
FWIW that A9 open in MP was due to balance the fact I had been super nitty the last few orbits.
worth about nothing dude, open fold. Who cares if you've been super nitty for a few orbits, that doesn't mean you should start playing badly. As played fold to the 3-bet.

Quote Originally Posted by Micro2Macro
How am I supposed to defend against crazy 3bettors if I never 4bet?
tighten your open range up loads, then widen your 4-bet range. 4-bet appropriate hands, 89s is way better to 4-bet than A9o, if you don't understand why then think about reverse implied odds, how 89s does against a calling/5-bet range, vs A9o, etc. Pick appropriate spots. Focus on the situations where villain's 3-bet range is weak. Etc.