PS $5 - KK with A on flop vs lag

[Maple Leafs]

Only 30 hands in, but villian is trying to be lag-ish (65/15/2). Have not seen him show down any bluffs. Not sure if he would bluff this, definitely sure he's playing any ace if he has one.

Is the pf raise OK? More? Push?

PokerStars Tournament, Big Blind is t50 (8 handed)

UTG (t1940)
UTG+1 (t1005)
MP1 (t1310)
MP2 (t1920)
Hero (t1190)
Button (t1245)
SB (t3610)
BB (t1280)

Preflop: Hero is in CO with K[img]/images/graemlins/heart.gif[/img] K[img]/images/graemlins/spade.gif[/img]
<font color="red">UTG raises to t100</font>, <font color="gray">UTG+1 folds</font>, <font color="gray">MP1 folds</font>, <font color="gray">MP2 folds</font>, <font color="red">Hero raises to t300</font>, <font color="gray">Button folds</font>, SB calls t275, <font color="gray">BB folds</font>, UTG calls t200

Flop: (t950) 6[img]/images/graemlins/club.gif[/img] A[img]/images/graemlins/spade.gif[/img] 9[img]/images/graemlins/diamond.gif[/img] (3 players)
SB checks, <font color="red">UTG bets t350</font>, <font color="gray">Hero ???</font>