Stratos

Good points above I would say you overplayed this hand.

I would not be worried about being exploited here. If you play (or attempt to) play a GTO strategy live you are leaving money on the table. That is, unless you are filled with a table of pros which in that case I would stand up.

The fact that you checked back and he potted into you on the river in a previous hand is not evidence he is exploiting your checking range. He could have just had value.

He could easily play many value hands this way. AA,QQ, strong Ax and he could get goofy with AK or AQ.. It seems you don't have enough info to say he is not betting thin here.

Even if he is bluffing, he should be some part of the time I doubt he is overbluffing as most don't and nothing says this guy is a spaz.

If you want to play GTO go ahead and call, you are way up in your range, you capped your range, etc etc. I would fold until I knew more.

I like a check back here for the reasons stated above. This is an excellent check-raise spot for villain as he would expect you to bet all of your flushes and Qx hands. Furthermore, you will have some difficulty finding many bluffs to support betting so thin. Likely, some made hands are going to have to be added to your range.

The great part about checking back is that you retain all of the equity that KQ has in the pot. This makes checking back massively +EV. Bet folding KQ here is a disaster IMHO as you will have to fold all of that equity if he C/R.

Some factors affecting this spot are villains cbetting tendencies OOP. Some players lead out with every hand AQ+, while other try to remain more balanced. Especially 3-way I have found it very common for many players to lead all QQ,JJ,33,QJ for fear of it checking through.

Interesting hand though!

As synapse said I don't see that many better hands folding. You are most likely double barreling many of your backdoor flush draws that hit on the turn right? Thus, I don't think your range is loaded with enough value to where I would want to turn Tx type hands into a bluff.

On the turn, Pretty sure you are beat at this point and are drawing to 2 pair/straight. Also, he could be potting with some overpair plus flushdraw hands which you aren't in good shape against. You aren't getting a good enough price to draw out and you are likely behind so just fold.

In regards to raising the flop. It would be nice to know how much villain is 3betting in this spot to get an idea of his range and if he is one to cbet 100% in spots like this. My standard here is a call though.

3b pre is fine. You are ahead of CO 50% range. However, I would consider just calling with hands like this especially since the BB is likely to tag along.

As played, if you are B/F this hand I would check back. Many bad aggressive players go crazy attacking paired board 1/2 pot cbets in low SPR spots. Also, you mention you have spade blockers? Sure, but you have the flush draw yourself. This only applies if you have say AAxx and one is a spade. The nut flush blocker does add some FE because many people shove any nut flush draw in low spr spots.

Also, how are you playing your range here? Are you 1/2 potting everything? Are you potting AAxx and strong queens? 1/2 pot bet folding this flop seems like a mistake unless you know the player well enough that he only is raising trips+. If they are shoving a worse flush draw your fold is a pretty big mistake. Pot calling has to be close to +ev here, but I think your ev is higher checking back.

Overall, I would be asking yourself some questions before you bet and if bet folding really sucks. Maybe you should realize some equity and learn more about your opponents hands by checking.

x2!