I am a young white kid.  I almost never play PLO and have not played with anyone at the table before.

Villain is a asian regular in his 40s who sometimes plays higher stakes and seems competent and intelligent. He was caught once bluffing 3 streets a few orbits ago.

Villain has 1700, I cover. It seems to me that all streets are debatable.

Pre: 3 limpers, I raise to 55 otb w Kh Qc Qd 6d.   Villain in BB calls and all limpers call.

Flop (290): Qh 9c 7c.  Villain leads 275, 3 folds, I call.

Turn (840): Kc.  Villain checks fairly quickly, I think for a minute and bet 500.  He calls after 1.5-2 min.

River (1840): Ac, Villain lead shoves all in for ~900 after thinking for 20 seconds. 

On the flop I don't feel like I have a significant equity advantage w dry top set so I choose to flat and play the turn in position. 

When the Kc comes, my plan was to bet turn and shove all rivers to get villain to fold straights and smaller flushes.  I think sometimes he x/f the turn w JTxx and sometimes he x/c one street, x/f the river. I also think he never x/shoves the turn w/o the A-hi flush.   I can also get value from sets on the turn by betting. 

On the river, I get very confused because I have the nut flush blocker and he lead shoves into me.  I think he's bluffing but I think some of his bluffs might beat me...

What do you guys think?  I'd love to get better at PLO!