I've run into a little trouble when checkraising a hand. Usually this situation occurs when I limp in ep with a PP and land a set on the flop. I check waiting for an aggressor to bet and triple his bet. 95% of the time he will call. the trouble happens on the next card. I've noticed that I usually check again on the turn. The reason being that I'm trying to make it look like I was bluffing or am now scared and hoping the guy will bet into me again. Unfortunately, this doesn't seem to happen. The guy usually also checks so then when I'm forced to make a bet on river he will usually fold . How would you guys suggest approaching this situation?

Extra info, I play 6max $25NL on party.