2/4 AA, when to slow down?

[Vermin]

UTG+2 is 10/7/1.6 over 59 hands.

Party Poker 2/4 Hold'em (10 handed) FTR converter on zerodivide.cx

Preflop: Hero is BB with A[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/club.gif[/img].
<font color="#666666">2 folds</font>, <font color="#CC3333">UTG+2 raises</font>, <font color="#666666">1 fold</font>, MP2 calls, MP3 calls, <font color="#666666">3 folds</font>, <font color="#CC3333">Hero 3-bets</font>, <font color="#CC3333">UTG+2 caps</font>, MP2 calls, MP3 calls, Hero calls.

Flop: (16.50 SB) 3[img]/images/graemlins/heart.gif[/img], J[img]/images/graemlins/club.gif[/img], T[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(4 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">UTG+2 raises</font>, MP2 folds, MP3 calls, <font color="#CC3333">Hero 3-bets</font>, UTG+2 calls, MP3 calls.

Turn: (12.75 BB) 8[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">UTG+2 raises</font>, MP3 folds, Hero calls.

River: (16.75 BB) 8[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">UTG+2 bets</font>, Hero calls.

Final Pot: 18.75 BB

Right to slow down at this time (when I´m raised on the turn)? When he capped it pre I´d think he most likely has KK, QQ or AK. Him calling my 3 bet on the flop and then raising the turn when a blank comes confused me a bit and I got worried about JJ so I just called it down from there.