($24) Flop decision with messed up AQs

[Pocketbear]

The villain is not very loose, but definitely not a tight one, has limped a couple of times recently too.

Full Tilt Poker
No Limit Holdem Tournament
Blinds: t80/t160
6 players
Converter

Stack sizes:
UTG: t1325
UTG+1: t2175
CO: t1335
Hero: t4355
SB: t1365
BB: t2945

Pre-flop: (6 players) Hero is Button with A[img]/images/graemlins/diamond.gif[/img] Q[img]/images/graemlins/diamond.gif[/img]
2 folds, CO calls t160 <font color="aaaaaa">(pot was t240)</font>, <font color="#cc0000">Hero raises to t480</font>, 2 folds, CO calls t320 <font color="aaaaaa">(pot was t880)</font>.

Flop: K[img]/images/graemlins/diamond.gif[/img] 5[img]/images/graemlins/heart.gif[/img] 2[img]/images/graemlins/spade.gif[/img] (t1200, 2 players)
<font color="#cc0000">CO is all-in t855</font>, Hero?

Meh... Push PF? Is BB (he is somewhat loose) a factor here? As played, is folding the flop weak getting more than 2 to 1?