Bet flop, call river, be ahead of two pair most of the time but don't be surprised when you see a 4. Raising probably isn't great here, because of the texture of the game that you described (but would be correct in other games). He might have called with a flush draw and put you on a lower one then bet out when it didn't complete on the river. I think you can pick off bluffs and worse hands a majority of the time.