Standard 3bet for me SB v BTN. Villain is 30/27 with a 67 f23b but it's only over 220 hands or so.

I don't think I fold out better hands and he's rarely folding a pair here.

Nothing has actually changed from the flop (though hands like 65s and spades picked up equity) but I think once he checks back, he has 9x/TT/JJ at most and very often hands like 88/77 that won't want to call two more bets.

Now all his 9x hands made trips, but that's not a huge portion of his range. I think he mostly has bluffcatching hands like 88/77/JJ/TT which may call a reasonably-sized bet. Am I right in thinking that when we perceive villain's range to be mostly bluffcatchers it's a good spot to overbet (for value and as a bluff)?