This is on MPN so I am going to try to write out the hh manually.

Villain is a reg that plays decent, I dont have any specific reads on him. We have been battling it out a bit and I stacked him a short while earlier when he bet pot ott and called off on 8 T A K board with AKTx vs my JQQK. Overall tho he's on the tighter side, I've been somewhat active but nothing out of line I think.

Villain opens from MP to 1.75
Hero BTN 3bets with AdJdJc7c to 6
folds to villain who calls

pot: 12.75$

Board : Qs Js 5s

Villain has 44$ behind, I cover.

How do we approach this spot when we want to build a plan postflop?

What are possible lines here and what do we consider? What if we were oop?

The only way to go about this one spot is to bring in your entire over-all strategy range wise in this spot. What are your frequencies when you have the nut flush, K high flush, absolute air, etc.

It will be hard to quantify the above things, and thus hard to even start suggesting how to handle this spot. In my opinion you could bet anywhere from 1/4th to half pot, or check behind. Depending on what your over-all idea in this spot will be, again. I probably wouldn't bet big, that seems bad with all hands

i vote check, the value of denying straight draws is lesser than the risk of getting check raised or check called, and we can induce a bluff

The more I think about it the more a check makes sense, like ppg said denying draws is lesser than getting c/r and Im pretty toast vs a c/r range and by checking I can somewhat pot control and see a free card in position.

As with regards to my range loctus, I usually do stab in 3b pots as I find ppl to be folding alot but I think K high flush def is a candidate for a check for me.

I'm pretty new to PLO so still figuring out how to construct my ranges in diff spots

What would you do with the nut flush, low flush, two pair, gutshots, OESD, wraps, air, and lone naked A/Kc on this board?

It's totally ok to check this back since this keeps a very medium-strong hand in our range for turn cards, but it's also totally ok to bet 1/5-1/4 pot with your entire range.

Betting only the nuts/nothing here is fine, you're just not gonna get paid off very often when you do it. The reason is if your opponent is thinking at all then he will know you have either nothing or the nuts, and can play pretty much perfectly vs. your range with the middle part of his range. If he blocks the nuts he can c/r and get you to fold every time. If you bet small for thin value he can draw profitably with his full house draws and fold his weakest flushes, etc etc

Conversely, if you're only betting polarized here, that means you can very rarely have a stronger hand than the nut flush by the river, so the 35ish % of the time the board pairs you're in trouble and easily exploited.

So in general my personal preference is to just continue to be aggressive with small bet sizes on both flush boards and a lot of paired boards with my whole range as it makes you tougher to play against.

Great response and gave me alot to think about, ty !

So when I bet small here what is my plan vs a c/r with my middle set?

I mean it depends SPR, on your opponents tendencies and also how he perceives yours. If it's an unknown in general hes underbluffing. You can start with this and adjust if you find your opponents are bluffing a lot.

With an SPR of 3.5, we kind of need to start building a pot if we have the Nuts here to set up a comfortable river jam. However, we can do this by betting small on the flop when we do have the nuts.

A benefit of a small bet is that it allows us to make more merged value bets on the flop. This hand can potentially be included into that range.

FWIW hero probably has more nut flushes than villain so you could construct some frequency where you're betting a bit more than checking, using typically a smaller sizing that you'd be using on this and other locked down textures. As for what to do with middle set specifically it's hard to say, checking makes sense to save having to face a X/r or allow villain to bluff but it is going to depend on how you'll approach your entire range here, what frequencies you're using for value hands like flushes, hands that are more protection/ merge like this one and total air.

Check/call flop and turn and try to make a full house or 4 of a kind. If you dont succeed by the river then fold if he bets again. People posting wall of text explanations for spots like this are drunk