I think you bet the turn too hard to now run a river bluff of any sizing.

I would assume that your turn sizing is narrowing his range down quite strongly towards sets and Kx. I definitely wouldn't make a practice of trying to get ppl off of rivered trips.

Not to mention trying to rep a strong hand when you're on the btn and perceived to have so much garbage. If villain has Kx which is likely, then you're repping 10 combos total (AK-4, 666-3, 888-3).

Do I think he'll fold 8x? Probably. But that's only a small part of his range after his turn call to your sizing imo.