KKxx bluff

[crashwhips]

Second reraiser has AAxx for sure, and he's capable of laying it down on the flop with this much money behind. Should I just pitch this preflop given that my KK is relatively uncoordinated? Is this a good spot to bluff postflop and if so was my bet-sizing good?

PokerStars Pot-Limit Omaha High, $1.00 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

BB ($53.45)
UTG ($222.05)
MP ($67.40)
CO ($45.55)
Hero ($142.30)
SB ($120.40)

Preflop: Hero is Button with 3[img]/images/graemlins/spade.gif[/img], K[img]/images/graemlins/spade.gif[/img], 9[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/heart.gif[/img].
<font color="#666666">3 folds</font>, <font color="#CC3333">Hero raises to $3.5</font>, SB calls $3, <font color="#CC3333">BB raises to $6</font>, Hero calls $2.50, <font color="#CC3333">SB raises to $24.5</font>, BB calls $18, Hero calls $18.

Flop: ($72.50) 6[img]/images/graemlins/heart.gif[/img], 2[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, BB checks, <font color="#CC3333">Hero bets $69</font>,