Bad time for a slow play?

[Bigwig]

Pokerstars $11 + rebuys.

BB is 600.

Hero UTG+2 (t7500)
Villain CO (t24000)

Hero is dealt A [img]/images/graemlins/spade.gif[/img]A [img]/images/graemlins/club.gif[/img]
All fold to Hero.
Hero raises to 2200.
All fold to Villain who calls.

Flop: A [img]/images/graemlins/diamond.gif[/img]K [img]/images/graemlins/heart.gif[/img]6 [img]/images/graemlins/heart.gif[/img]

Hero checks.
Villain checks.

Turn: Q [img]/images/graemlins/club.gif[/img]

Hero bets 2400.
Villain reraises to all-in.
Hero calls.

I lost. He made the A high straight.

Now, this is not generally a scary straight board, correct? But there was a straight draw and a flush draw. Despite having an apparent lock, can I afford to slowplay this? My thought was to appear afraid of the big cards, and hope the Villain makes a play at the pot. But, with such a short stack, was this a mistake?

Thanks for your feedback.