Hero?

I think villain is reppin 86xx and 64xx otr. The Nuthand which most likely has called my potsized flopraise is 865x which is not veery likely in his ep-range, On the turn he might be floating some semi-bluffs or bettin weaker made hands 4 value and I have an odds-call anyways. I dont know how often the theory requires me to def rivers, but once I called the turn I felt very uncomfortable folding to that river blank. On the other hand, experience tells me villain is underbluffing this spot, especially tight regulars (he was a 25/15 tag).

PS: If the river pairs, would you check to go for a bluffinduce or would you donkbet pot?