This is 10NL, the guy is a "reg". Fast forward yesterday, we have this hand. I open 67s from UTG (I know..., but we are 5 handed ...), he calls from the MP. Flop comes 496 rainbow. I check and he pots. I thought of this as a vulnerable value hand, like A9s or K9s, and maybe some backdoors as bluffs, so I called. Then the T hits and I check, he bets a weird sort of 1/2 pot bet. I thought he bets now very thin, cause he no longer have TP. I think is probably a check for him in this spot and try get the 9 to showdown. So because of this I decided to raise. I can have KJ, J8s, 78s and even some slowplayed sets for value, while is not so easy to find bluffs. 87s got there. So I decided to go a bit more of 3x for a turn check raise, with 4 outs to an 8 if get called. But I tought I had some fold eq. He called and the river is the Q, completing the straight for KJ and J8s. I shove and get called. I don't know if the river shove is good. I'm kind of confused about the bluffing spot, if anyone can share some light on the subject I'd be grateful. thanks!