Unknown villain

Standard steal. Our opponent is unknown but the population is folding too much to steals so even though he is unknown we should be aware of the fact that we play against a tighter range here. Especially hands like low suited Kings and low suited Queens and hands like J6s I wouldn't expect in his range.

Standard cbet with a gutshot. This is a 100% bet for me although there is some merit to checking back especially with the backdoorflushdraw.

I expect his check/raising range here to be very madehandheavy. We get like 2.5:1 so this should be a +EV call against a range that consists mostly of sets and straights (we block some straights holding the 7c). Also I'm 100% sure that most people fold 75o preflop and T7o as well so I do expect him to have T7s and 75s only which are 6 combos but I do also expect him to be check/raising here 66,88,99,K9s,K8s maybe K6s so the turncall should be fine. We only call for the split if he has a straight but if we hit our flush we have some implieds vs his straights and vs his sets also.

Our opponent bets pretty fast on this river. Based on my assumptions I think I'm ahead quite often however I'm not sure if the average unknown is calling off worse here.

What is your opinion about the riverplay? Folding falls out of the question the only question is do we just call or should we raise because we expect him to be calling us off with 7x?