two pair vs turned flush?

[hERESY]

Reads: I'm trying to play hands with this guy heads up. So far he has played > 50% of hands.

PokerStars No-Limit Hold'em Tourney, Big Blind is t100 (9 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Hero (t3960)
Button (t5950)
SB (t1490)
BB (t2080)
UTG (t2085)
UTG+1 (t4540)
MP1 (t1355)
MP2 (t1920)
MP3 (t3680)

Preflop: Hero is CO with 7[img]/images/graemlins/diamond.gif[/img], 6[img]/images/graemlins/spade.gif[/img].
<font color="#666666">5 folds</font>, <font color="#CC3333">Hero raises to t275</font>, <font color="#666666">2 folds</font>, BB calls t175.

Flop: (t600) T[img]/images/graemlins/heart.gif[/img], 7[img]/images/graemlins/spade.gif[/img], 6[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, <font color="#CC3333">Hero bets t325</font>, BB calls t325.

Turn: (t1250) 4[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, Hero

Input on what you do here. Is 1/2ish flop bet too little? Oh yeah? Too little you say? Why?

Do you check behind this turn often because this donk might give you a cheap showdown with a made flush?