I think the way you played the hand is fine. I'd play it the same way except the river against this particular villain. You can rep sets and two pair type of hands pretty good but with his wtsd stat being 38 he is snap calling you with any two and the river bet against such an opponent is probably -ev. Some of the time I'll give up, some of the time I'd bet smaller like 6. You are giving you a better price for your bluffs since I don't think a bigger bet will make him fold more.  

I try not to bluff the guy with wtsd 38. I would just give up unless i have more reads. If you bet otr, I expect him to call with decent 2pairs. Given that you block high cards, he probably have a made hand

Checking behind OTT and betting the OTR for value doesnt make sense with any hand. Villain should call you with his entire showdown value (2pair+). Therefore i just give it up. 

Another option would be to triple barrel. Mostly, if you bet OTT you will get called by plenty of draws/2pairs/str8s (nuts will raise). So you will need to barrel the river in order to make him fold hands that didnt improve him, but that still beat you.

I x this flop back, would be supernasty if he x/r because we dont get the odds then.

We can call almost all turn leads if villain decides to lead turn and if he x turn we can try to steal it by betting a lot of turns+rivers.

With those postflop stats I would not launch a triple barrel. A flop pure bluff in isolation with your sizing would be around EV neutral if he folds 45%. But you have very good equity versus his calling range as well, and you're basically building the pot for when you hit. This is a must-c-bet against a loose-passive player, no matter his fold tendencies on future streets. Getting check-raised doesn't concern me much, given his passive 41/1 preflop style (which probably carries over to postflop). 

When you don't hit, you're not obligated to keep betting. I would not continue to semibluff, since he 1) calls turn a lot, and 2) goes to showdown a lot. The thing about these passive and sticky players is that they will pay you off whether you bluff or not. Unless you want him to call, or you have a good semibluff + decent fold equity,  don't bet, and that goes for any street.

yeah, I try to work on it, I also see problem here.most regs on the stakes that show good bb\100 are cbetting around 60% or even less. its an issue, but defenetely not the only one to improve the game