Thanks for the feedback guys.

When you checkraise that flop and villain clicks it back he shouldn't be doing that with ace x as he is just bloating the pot the times u re raise him back with trips, so its either king x plus or air.

I think this is absolutely correct for a thinking player. But a fish can reraise Ax here a non-zero percent of the time. And there are 3 combos of Ax left in the deck, only 1 combo of Kx & there are likely more Ax in his preflop 3x range. I also thought (maybe incorrectly) that when he flatted rather than jammed vs my NAI reraise that his range might have more Ax & FDs relative to the Kx.

I do expect villain to float you here sometimes with his flop 3bet bluffing range to see what you do on the turn as the times you are bluffing you should really be giving up as his perceived range will look so strong to take that line and he will get to take the play away from you on the turn or river.  If the runout blanks out here i assume you aren't folding so you would need villian to be 3betting the flop and calling a 4bet pretty merged or put him on a really narrow range of AA and AK to justify a fold.

If I expect villain to float me with a decent percentage here I am probably checking turn to induce and calling down because his floats have to bet. But my motivation for reraising flop was to get value from what I thought he would call down with Ax & FDs. Because I expect a fish to have more Ax in his range here given the preflop 3x & their general propensity to play FDs passively more often than not, I felt the turn was the worst card in the deck for me vs villain's range. His check back was a bit confusing but when he potted the river I felt like his range was polarised between missed FDs & trickily (suboptimally) played Ax. I also considered that I am calling some percentage of the time simply to split the pot, but I thought his sizing decreased the likelihood he held Kx (I see people bet smaller with Kx here).

Not really sure what you mean by having to put him on AA or AK? Any Ax beats me here. Do you not expect him to reraise his Ax and flat it when reraised again? My perception of fish in this spot is that they will overplay Ax a lot because they are terrified of two tone boards hitting on a later street and devaluing their hand. Do you think I am assigning too much weight to Ax to his starting turn range given the preflop & flop action?

In summary, I felt like I was up against Ax most of the time here combinatorically and usually when a fish pots the river they have it. My main concern is that I put myself in a position on the turn / river OOP that had me folding a very strong holding. Expectation wise, it's pretty irrelevant because the part of his range (Ax) that I am most actively targeting when I reraise the flop here blocks the turn card that makes this spot so gross. So across my entire strategy I guess it doesn't cost me too much to have to give up on this run out.

I also posted the hand on 2+2 and some guys suggested the call pre was probably incorrect OOP while still so deep. But I didn't have any reads about what his 3x meant at that time (hadn't seen his other opening frequencies yet) and not defending such hands would make me pretty easy to play against because it would contract my defending frequency so much and unbalance a lot of my c/c ranges on K hi boards postflop.