Devin, my thoughts pretty much exactly. If I do bet the turn I have to continue on the river and fold out 88-66 which I think is the majority of his range. He's also probably capable of folding T9/98/97 but it's not something I'm counting on. Also, something I forgot to include was that he sorta thought a little before calling the flop/turn which leads me to believe his range is weighted almost entirely to medium PPs or TPNK.
However the only problem with raising less on the turn is that a good hand reader is going to be able to see through my bet size because I wouldn't bet so small on a double suited board with a set or overpair ever (although I don't give villain credit for knowing this). The only value hands I'd want to bet small are 65hh and 65ss only.
Karp, sometimes I'll make it 16 or 17. Its something I'm still playing with. Also, I wouldn't continue on the turn and def wouldn't bet the river if I thought he wasn't capable of folding PPs