checkraising the river in the party 100/200

[tl65\]

I'm just trying out the party 1/2 games and noticed some spots where i'm missing value by checkraising the river where I'm pretty sure it would've worked aginst a 30/60 LAG. The villain(LAG) seems like a regular in the game, I have him at 32/16/1.4 after about 1500 hands and in my previous hands with him, i've played very aggressively. Seems to get a lot of action when he has hands and has been running the table over since i've been there.

Ok... here's a hand

I raise UTG+1 with 66, LAG calls from MP, SB calls

Flop comes A 6 5 all hearts

I bet, LAG raises, SB folds, I 3-bet, call

Turn: offsuit 3

I bet, he calls

River: offsuit 9

check, check

Feel free to comment on comment on the rest of the hand, but the river's what I'm wondering about. He's representing an A or a flush draw, so i'm thinking if he has an A, he'll bet the river and i can raise and if he's got a draw, i'm not losing anything and he might take a stab at it with a bluff. Thinking about it more, it seems like he might not bet a weak A since he's basically in the same boat, where there's not a whole lot I'm calling with that he can beat.

thoughts?