AA on button, difficult turn decision

[11t]

So I did not excercise correct pot manipulation with my flop raise. Villain isn't that great. I doubt he has a set since he called a raise and a re-raise. AK, KQ, or a flush draw (ie a terribly played AQs) are his most likely holdings.

I also realize my pf re-raise was weak but the original raiser was a donk and I wanted to isolate him but make sure he called preflop.

Should I have raised more pf anyways? Should I have raised more on the flop? What do I do on the turn now?

PokerStars No-Limit Hold'em, $0.25 BB (6 handed) converter

BB ($9.90)
UTG ($24.40)
MP ($40.90)
CO ($15.45)
Hero ($21.10)
SB ($23.25)

Preflop: Hero is Button with A[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">2 folds</font>, <font color="#CC3333">CO raises to $0.5</font>, <font color="#CC3333">Hero raises to $1.5</font>, SB calls $1.40, <font color="#666666">1 fold</font>, CO calls $1.

Flop: ($4.75) K[img]/images/graemlins/spade.gif[/img], 3[img]/images/graemlins/heart.gif[/img], 5[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">CO bets $0.75</font>, <font color="#CC3333">Hero raises to $4</font>, SB calls $4, CO folds.

Turn: ($13.50) J[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, Hero...