I had a question about a hand I played today. I'm very new at PLO, coming from an NLH background. Looking for advise on how to play at every point in this hand, so any criticism on any street is more then welcome, but I am most concerned about the river. I wasn't sure how much of my range I could call down with, especially since I let him in so cheap with the smaller bet sizes on the flop and turn. The hand is below, thanks in advance for any advice!

Winning Poker Network (Yatahay) - $0.02 PL Hi (6 max) - Omaha Hi - 4 players
Hand converted by PokerTracker 4

BB: 101.5 BB (VPIP: 66.67, PFR: 66.67, 3Bet Preflop: 0.00, Hands: 3)
Hero (CO): 114 BB
BTN: 158.5 BB (VPIP: 50.00, PFR: 50.00, 3Bet Preflop: 50.00, Hands: 2)
SB: 100 BB (VPIP: 33.33, PFR: 0.00, 3Bet Preflop: 0.00, Hands: 3)

SB posts SB 0.5 BB, BB posts BB 1 BB

Pre Flop: (pot: 1.5 BB) Hero has T A J 3

Hero raises to 3.5 BB, BTN calls 3.5 BB, SB calls 3 BB, fold

Flop: (11.5 BB, 3 players) 8 9 3
SB checks, Hero bets 5.5 BB, BTN calls 5.5 BB, fold

Turn: (22.5 BB, 2 players) A
Hero bets 11 BB, BTN calls 11 BB

River: (44.5 BB, 2 players) 8
Hero checks, BTN bets 44.5 BB, Hero calls 44.5 BB

i prefer a c/c on the flop

River: I would bet/fold river @30-50% pot.

Assuming villain is an "average" 2PLO player then
Villain's range has very few boats (89, A8, 83? - but usually not AA, 99, 88, 33), a random 8 that got to the river, some AK[TT]+ type hands aswell as A9, some flushes and a ton of air.

Betting the river, because getting called by almost every flush, some trips, occasionally AK[TT]+ and A9 - especially with the Ad (don't ask me), most of which usually check behind.
Getting raised by 89, A8, sometimes 83 and very rarely naked trips.

As for your question: I can't really answer it. Generally speaking the population is underbluffing, which is why I am generally overfolding and also usually not checking to induce. However, what a player deems worthy of valuebetting can be strange at times.

Fold pre. If the A were suited, or you're OTB, it's playable

AP I like the line otf/ott. River is a trivial x/f, or a tiny blocker bet makes some sense.

He's repping what exactly? 83?

There aren't many combos of 89 that don't want to raise flop except maybe KK89

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what do you guys think about the flop and turn bet sizings?

Grunching.

Preflop is loose, but being in the CO I think you're probably okay. It might be close with PLO2 rake.

Check/call flop, or at least bet smaller. You don't block continues very well and this flop is dry and not helping your range often. You don't really want to make the pot much bigger here.

As played, check turn. You've got some okay SDV and an okay draw but it's just all pretty marginal so you don't want to be inflating the pot OOP, imo.

OTR: you probably want to be check/folding here. You could MAYBE get away with bet/folding small, but that's a huge maybe. You just lose to a ton of combos.

A bit too small, especially on flop we are happier to get more folds.