Hand from the $50+R on PS. How do you proceed on this flop

The Villain in this hand is colsen10 and as usual he has been very very active. 3rd to act he makes a standard raise and I defend my blind with Q8 suited and flop a flush draw. I know that colsen's range is off the charts here so How should I approch the betting?

PokerStars No-Limit Hold'em Tourney, Big Blind is t150 (8 handed) converter

Hero (t7290)
UTG (t5525)
UTG+1 (t5100)
MP1 (t11065)
MP2 (t5350)
CO (t4073)
Button (t7722)
SB (t7100)

Preflop: Hero is BB with Qh, 8h.
2 folds, MP1 raises to t450, 4 folds, Hero calls t300.

Flop: (t975) 2s, 5h, 9h (2 players)

Final Pot: t975