C-bet percentage question

[bruin]

What percent of the time do you bet this flop (this is from a Speed 33)? 80%? More?

PartyPoker Speed Tournament, Big Blind is t100 (9 handed) Converter on pregopoker.com

UTG (t4264)
UTG+1 (t1475)
MP1 (t1278)
MP2 (t3390)
MP3 (t1885)
Hero (t1910)
Button (t1478)
SB (t2180)
BB (t2140)

Preflop: Hero is in CO with K[img]/images/graemlins/spade.gif[/img] A[img]/images/graemlins/club.gif[/img]
<font color="gray">UTG folds</font>, UTG+1 calls t100, <font color="gray">MP1 folds</font>, <font color="gray">MP2 folds</font>, <font color="gray">MP3 folds</font>, <font color="red">Hero raises to t350</font>, <font color="gray">Button folds</font>, <font color="gray">SB folds</font>, <font color="gray">BB folds</font>, UTG+1 calls t250

Flop: (t700) Q[img]/images/graemlins/club.gif[/img] 2[img]/images/graemlins/heart.gif[/img] 9[img]/images/graemlins/heart.gif[/img] (2 players)
UTG+1 checks