All looks fine to me dude. I might go bigger on the flop but not by much, I want single heart hands to call. Make the turn shove more trivial. What would you have done if loose guy had jammed the flop over your bet? I'd be hating life but calling I guess with top top in a 3bet pot.

He could still have single hearts, pair and draw or combo draw type stuff.

What about the plan if the nit had cbet? Its hard to believe he was a 10/6 if he was squeezing here then x/f on that flop. I guess its possible he had QQ no heart. But with fish likely to call and UTG to play back is he going to be doing it light? If UTG and caller were more reggy then fine but seems like would be merged value.

V btn it's OK I may check flop but betting cnt b horrible once cled I'm a lil worried he can just have a flush but again cnt be awful to have turn..

Looks fine to be honest. Don't want to be giving a free card on this flop, and the sizing looks great. Hard for villain to have a set or made flush given he doesn't raise + he is a donk also. Still gonna be somewhat thin depending on his exact tendencies but I'd expect the line to be +EV given the reads.

Well played hand.

4betting when you opened UTG and got two callers isn't going to be good, calling was definitely right.

Bet size on the flop is good. Enough to leave a shove on the turn but you can still fold if shoved on without losing much.

On the turn if CO is bad then nothing else to do but go for it and hope he calls with a heart or worse pair

Thanks everybody, @thetallpaul I think I would probably fold if loose guy shoved flop, HU I would call most times but after a multiway pot I'd be miles behind a lot more often. If the nit bet out I would be very concerned but do the wimpy call/evaluate turn stuff.

Thanks all.