somewhat awkward spot, villain 4 bet/folds somewhat frequently i woulda jammed with AK for sure, but with KK and AA i feel that villain's mistakes can be magnified with post flop play. but this flop is really crappy, -.=

what is your default play and how do you proceed? what do you think of my turn bet size?

What kind of flop is going to magnify his mistakes if you put him on a strong range? Anything he's going to get it in with postflop he was going to get it in preflop with as well, where he stands a much higher chance of making a mistake like stacking off with JJ, QQ, AK, maybe even AQs if he's really bad. Letting him see a flop I think just lets him off the hook with all of these, unless he's so terrible he's getting it in with TP. And why do you wanna ship AK preflop vs a player who is prone to make more mistakes postflop? If there was any hand worth flatting here I would say it's AK and never KK/AA.

5B/Shove get it in preflop