First post at 5/10 - nut flush draw on paired board

[TheWorstPlayer]

I just started playing 5/10 and I have been running horrifically. But I also think that some bad play has creeped into my game (or it was always there perhaps). Here was one hand that I think may have been pretty bad. Please let me know.

CO is pretty tight/passive. SB is quite LAG.

Party Poker No-Limit Hold'em, $ BB (6 max, 6 handed) FTR converter on zerodivide.cx

UTG ($781.50)
MP ($1549.74)
CO ($903.80)
TWP ($1000)
SB ($1922)
BB ($2433.50)

Preflop: TWP is Button with 4[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/club.gif[/img]. SB posts a blind of $5.
2 folds, CO calls $10, TWP calls $10, SB completes, BB checks.

Flop: ($40) K[img]/images/graemlins/spade.gif[/img], K[img]/images/graemlins/club.gif[/img], Q[img]/images/graemlins/club.gif[/img](4 players)
SB bets $30, BB folds, CO calls $30, TWP raises to $200, SB folds, CO calls $170.

Turn: ($470) T[img]/images/graemlins/club.gif[/img] (2 players)
CO checks, TWP bets $300, CO pushes, TWP...?

Call or fold? And how bad was my flop raise?