AKK2 hand overly aggressive after preflop raise?

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Omaha Hi/Low $0.50-$1 (real money), hand #1,109,448,451
Table Meridian, 27 Jul 2005 1:56 AM ET


Hero is CO with K[img]/images/graemlins/club.gif[/img] 2[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/diamond.gif[/img] A:diamond

PRE-FLOP
3 calls, hero raises, buton folds, SB folds, BB calls, Limpers call

FLOP 6[img]/images/graemlins/heart.gif[/img] 4[img]/images/graemlins/heart.gif[/img] J[img]/images/graemlins/spade.gif[/img]
Checked to Hero, Hero bets, 3 people call

TURN 6[img]/images/graemlins/heart.gif[/img] 4[img]/images/graemlins/heart.gif[/img] J[img]/images/graemlins/spade.gif[/img] Q[img]/images/graemlins/diamond.gif[/img]
Checked to Hero, Hero bets, everybody calls

RIVER 6[img]/images/graemlins/heart.gif[/img] 4[img]/images/graemlins/heart.gif[/img] J[img]/images/graemlins/spade.gif[/img] Q[img]/images/graemlins/diamond.gif[/img] 9[img]/images/graemlins/heart.gif[/img]
checked to Hero, Hero checks

SHOWDOWN
UTG limper shows 2[img]/images/graemlins/heart.gif[/img] 6[img]/images/graemlins/spade.gif[/img] 5[img]/images/graemlins/diamond.gif[/img] 3[img]/images/graemlins/spade.gif[/img]
UTG+2 limper mucks cards
BB shows A[img]/images/graemlins/heart.gif[/img] 2[img]/images/graemlins/diamond.gif[/img] 5[img]/images/graemlins/club.gif[/img] J[img]/images/graemlins/diamond.gif[/img]
Hero shows K[img]/images/graemlins/club.gif[/img] 2[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/diamond.gif[/img] A[img]/images/graemlins/diamond.gif[/img]
Hero wins $10.70.

I was pretty surprised to take down this pot..

Am I too aggressive in this hand? My preflop raise should have some EV+ but perhaps my postflop play that follows from the preflop raise is costing me money..