KK + flush draw on monotone flop

[n1bd]

10-handed 5/10.

UTG starts with 235, I start with 1009, CO covers.

UTG, who is a bit loose pre- and especially post-flop, limps. I raise to 40 in CO-1 with K[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/diamond.gif[/img]. CO calls, UTG calls.

Pot is 135, flop is 9[img]/images/graemlins/club.gif[/img] 8[img]/images/graemlins/club.gif[/img] 2[img]/images/graemlins/club.gif[/img]. UTG bets out 50, I raise to 220, CO makes it 500, UTG folds.

I'm facing a 330 bet in a 905 pot. If I get all in versus CO, I get 1.8:1 and he gets 3.1:1.

CO is generally passive postflop and goes too far with his hands. PT (~1000 hands) says he is 30/6 preflop; aggression by street postflop is 0.41 / 0.75 / 1.53; won $ at showdown 54%; went to showdown 44%.

I have a weak tight-aggressive image. I have raised a few times this session and given up before or after a continuation bet. I am unknown to my two opponents (PT DB is from a different screen name).