I did kind of want the first hand I posted to be from a HSMTT, but this spot is kinda tough and since Mitch posts on here I thought it'd be interesting to see what you guys think.
Reads:
So far in the game Mitch has been kinda quiet, playing a pretty solid TAG style and mumbling some disgruntled comments about how bad his seat is (I'm on his direct left) because I was messing with him a little bit by 3betting him in pos and raising/floating his cbets. He'd been playing pretty well from what I'd seen and hadn't got out of line yet.
OK, Mitch is playing about 2k I think and I'm sat about 1300 deep and we're playing 2/5 with an occasional straddle to 10 on the btn. This pot wasn't straddled.
He opens to 15 in the c/o and I peel the btn with

. One peeler cold and we see a

flop.
He bets 35, I call the peeler folds. I just call here because I'd been floating a lot of flops and it fitted into how I'd been playing much more than raising, and I thought he'd get his barrel on on quite a lot of turn cards.
Turn is a gross

. He checks reasonably quickly, I bet 30 (I like to do this sometimes against good thinking players so I can overbet the river and fuck with their head a bit and for balance, it means I can do this as a really cheap bluff later on). He calls.
River is the

. He checks, I bet 100 he thinks for about 30 secs and makes it 225.
Can he really ever be bluffing here? Or more appropriately, is he bluffing enough in a spot where he can easily bluff catch a lot of hands. I thought that he could be trying to buy me out of a chop with A high, or had 67/T7 and is now bluffing. I guess it's hard for me to call unless I've got an 8 or a 9, but it really didn't look like he expected me to fold that much, since he's repping pretty thin. I'm pretty sure he always barrels the turn with a 9 or a turned boat (but might be wrong). And because of my turn sizing I'm aware that I've opened up his turn calling range massively so he could have called with a pair of uno cards on the turn and now just be getting FPS, but I honestly don't think he steps out of line that much on this board texture surely.
It just really felt like 78/8x to me.
Does anybody think he's bluffing enough to call? I don't want comments about my turn bet because that was just a stylistic thing really.