Overplaying top pair in these situations is a good way to trap yourself against a higher pair.

I might just check behind on the turn and try to show the hand down, or make a smaller turn bet and check behind on the river. I may even just call him on the flop since you have position. What do you suspect he called your flop raise with? He's drawing to at most 3 outs if you're ahead, and you could easily be well behind. There's no point in trying to aggressively protect the pot.