[BluffTHIS!]

I would raise like acorns said in the situation as played.

The better situation for slowplaying would be if there had been a bet on the flop and hero called with an overpair+nutflush draw+wheel draw (wheel draw might be good against a low set). In that case when hero hits the K on the turn, his hand is going to be very disguised unless the flush comes, and with position can often get a checked river if he wishes if a straight card gets there. But when a straight doesn't come and he was up against a lower set, the other player isn't going to have a clue most likely leading to a bigger payoff on the river.