Villain is 17/12 with 31% steal. vs 3 bet: 66% fold, 16% call

No-Limit Hold'em, $1.00 BB (9 handed) - Hold'em Manager Converter Tool from FlopTurnRiver.com

saw flop

UTG+1 ($112.95)
MP1 ($113.15)
MP2 ($100)
MP3 ($89.50)
CO ($100)
Button ($27.70)
SB ($52.70)
Hero (BB) ($114.75)
UTG ($147.25)

Preflop: Hero is BB with K, K
5 folds, CO bets $3, 2 folds, Hero raises $9, CO calls $7

Flop: ($20.50) 2, 5, 7 (2 players)
Hero bets $11, CO raises $28, Hero calls $17

Turn: ($76.50) Q (2 players)
Hero checks, CO bets $30,Hero???

So I'm trying to fix my leaks, and I think one of them is folding out strong hands too often. The only "bluff" I could see that would do this on the turn is AsQs, either that or he went spewy with 99 and such. Is this a weak-tight fold in a 3bet pot with K-K?