The thing about the stars 6max game is that most of the people who will bluff at all are so aggro that they will bluff when you check the turn. There are very few players who wont bluff the turn, but will stick in a pot sized bluff on the river IMO.

I dont think you are up against a player who is cautious on the turn but bluffs the river often enough to call a PSBluff.

Also this is kind of going round in circles now so its probably results time.