i 3bet/call for value pre. i think vs this guys 4bet range (loosely 99+,AQ+) we have decent enough equity. plus he's flatting a shitload worse. i'm also of the adjust 3bet sizing down based on effective stacks camp, and i probably make it 3.5x here. as played i don't know what to do on the flop, but i think what you did is possibly the worst thing to do. he folds very little that beats us, 66+, Kx, and we have little pot equity vs that calling range. plus our SPR is pretty low due to his short stack so it becomes more of a mistake to cbet/fold. i typically check this flop for reasons stated above (fold nothing better, smallish SPR etc etc), but i'm too passive postflop even for FR, and i assume 6max plays a little more aggressive, so take it with a grain of salt