Ok, having read everybody else's response, I've got an easier time of it.
Having not bet out, you had little choice but to reraise, which did indeed cost you some money. I put the first raiser on AQ or some kind of draw and the button on a pocket pair. I agree the board is coordinated, but I don't put either of them on a draw to the board, esp since they folded.
If you had bet out, you might have been showing something like A-T for a TPTK and should have at least one caller, then smack them on the turn depending on the turn card. It would have disguised the set, I think. When you check/raised, they correctly saw you had a big hand and correctly folded.
I rarely slow play, although I am not as aggressive with sets. I slowplayed a full house yesterday, but one of my opponents sniffed it out and folded the river. I would have made them pay a high price for seeing the river card, had I not had the boat on the turn.
Shoulda bet. Since you didn't, reraising was correct, imho. But what do I know. I don't play at such a lofty altitude.
"Are the players better as the stakes go up? It's not an exam; it's a buyin." Barry Tanenbaum