($6.50 PS) Postflop play with AK, early round

[Quercus]

Villain has been tight.

PokerStars Tournament, Big Blind is t50 (8 handed) Converter on pregopoker.com

UTG (t2560)
UTG+1 (t1425)
MP1 (t1570)
MP2 (t1075)
Hero (t1530)
Button (t2435)
SB (t1315)
BB (t1590)

Preflop: Hero is in CO with A[img]/images/graemlins/diamond.gif[/img] K[img]/images/graemlins/spade.gif[/img]
UTG calls t50, <font color="gray">UTG+1 folds</font>, MP1 calls t50, <font color="gray">MP2 folds</font>, <font color="red">Hero raises to t300</font>, <font color="gray">Button folds</font>, <font color="gray">SB folds</font>, <font color="gray">BB folds</font>, UTG calls t250, <font color="gray">MP1 folds</font>

Flop: (t725) 4[img]/images/graemlins/diamond.gif[/img] 5[img]/images/graemlins/heart.gif[/img] T[img]/images/graemlins/heart.gif[/img] (2 players)
<font color="red">UTG bets t150</font>. Hero?

Folding doesn't feel right, so push or float here?

(Yeah, I don't like the size of my PFR here either.)