QQ - allin decision on flop

[campi]

$150+12 Poker Room weekly Euro Grand Prix, early in the tourney, 2nd level.
I have got 3725 and it's my first appearance in such heights. In fact, I have got some $10-30 MTT and SNG experience, but play them only when i get bored playing my ring game (like now, in this semester's exam period [img]/images/graemlins/smile.gif[/img] ). I'm also new to the MTT forums, so just tell me if my post is incomplete or something.
UTG+2 is having 5155, a few hands before he minraised preflop with KK and stacked a guy with AQ on a Q high board (starting stack was 2500). Otherwise he was playing tight.
BB (1300 in chips) has played a few small pots (usually he was the agressor), and a big one. I open-limped in MP with 55, called a minraise and saw a 5-way flop: T95r. I bet half the pot, got 2 callers behind me. An 8 came on the turn, I bet 350 into a ~550 pot he raised to 700 I pushed, he folded, clearly not having much of a hand.



Poker Room skin
No Limit Holdem Tournament
Blinds: t15/t30
10 players
Converter

Pre-flop: (10 players) hero is SB with Q[img]/images/graemlins/diamond.gif[/img] Q[img]/images/graemlins/club.gif[/img]
2 folds, <font color="#cc0000">UTG+2 raises to t60</font>, 5 folds, <font color="#cc0000">hero raises to t105</font>, BB calls t90 <font color="aaaaaa">(pot was t180)</font>, UTG+2 calls t60 <font color="aaaaaa">(pot was t270)</font>.

Flop: 7[img]/images/graemlins/diamond.gif[/img] K[img]/images/graemlins/club.gif[/img] 8[img]/images/graemlins/club.gif[/img] (t315, 3 players)
<font color="#cc0000">hero bets t240</font>, <font color="#cc0000">BB raises to t1180</font>, UTG+2 folds, hero ...

1. was my pfr big enough?
2. what factors do I need to consider in this allin calling/folding situation?