50 NL - AKo on flop

[thing85]

Villain is 17/17 over 36 hands, which isn't too helpful.

Poker Stars - No Limit Hold'em Cash Game - $0.25/$0.50 Blinds - 6 Players - (LegoPoker Hand History Converter)

SB: $152.45
BB: $60.30
UTG: $22.85
MP: $40.80
CO: $58.90
Hero (BTN): $49.75

Preflop: Hero is dealt K[img]/images/graemlins/spade.gif[/img] A[img]/images/graemlins/club.gif[/img] (6 Players)
3 folds, <font color="red">Hero raises to $2.00</font>, SB folds, <font color="red">BB raises to $6.25</font>, Hero calls $4.25

Flop: ($12.75) 2[img]/images/graemlins/diamond.gif[/img] T[img]/images/graemlins/spade.gif[/img] 6[img]/images/graemlins/club.gif[/img] (2 Players)
<font color="red">BB bets $8.25</font>, Hero...?


These type of hands come up often but I also seem to feel lost when I don't hit. Do I 4bet PF? Raise the flop? Or just let it go? I didn't 4bet PF because I don't want the pot size to get out of control, but with a larger sample on this guy, I probably could've made a more confident move.

Help?