1/2 JJ - cap pre-flop? How to proceed unimproved?

[Triggerle]

This is a hand that came up in my session review. The table has been tight sometimes and loose sometimes but in every case aggressive.

PokerRoom 1/2 Hold'em (9 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Preflop: Hero is MP2 with J[img]/images/graemlins/heart.gif[/img], J[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">1 fold</font>, UTG+1 calls, MP1 calls, <font color="#CC3333">Hero raises</font>, <font color="#CC3333">MP3 3-bets</font>, CO calls, <font color="#666666">3 folds</font>, UTG+1 calls, MP1 calls, <font color="#CC3333">Hero caps</font>, MP3 calls, CO calls, UTG+1 calls, MP1 calls.

Flop: (21.50 SB) 5[img]/images/graemlins/heart.gif[/img], 9[img]/images/graemlins/spade.gif[/img], K[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(5 players)</font>
UTG+1 checks, <font color="#CC3333">MP1 bets</font>, Hero calls, <font color="#CC3333">MP3 raises</font>, <font color="#CC3333">CO 3-bets</font>, UTG+1 calls, <font color="#CC3333">MP1 caps</font>, <font color="green">Hero folds</font>, MP3 folds, CO calls, UTG+1 calls.