Laydown KK to A-high flop hand history: Raise more PF and a bad call?

[nova]

I'm not sure if I should have raised more PF: obviously it worked out fine for me since I would have been busted out, however I'm not sure if raise more PF I can drive out the two callers with Ax. In addition after looking at the hand again, I hate my call on the flop and realize this is probably a bad play. I figured this was a probing bet to determine where they stood. After the raise / call, I had to get out of there. Thoughts?

Party Poker No-Limit Hold'em Tourney, Big Blind is t30 (8 handed) converter

SB (t1240)
BB (t880)
UTG (t1115)
UTG+1 (t720)
MP1 (t560)
MP2 (t755)
CO (t2075)
Hero (t655)

Preflop: Hero is Button with K[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/spade.gif[/img].
UTG calls t30, <font color="#666666">2 folds</font>, MP2 calls t30, <font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to t90</font>, <font color="#666666">2 folds</font>, UTG calls t60, MP2 calls t60.

Flop: (t315) T[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/heart.gif[/img], 4[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
UTG checks, <font color="#CC3333">MP2 bets t80</font>, Hero calls t80, <font color="#CC3333">UTG raises to t250</font>, MP2 calls t170, Hero folds.

Turn: (t895) 6[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
UTG checks, <font color="#CC3333">MP2 bets t100</font>, UTG calls t100.

River: (t1095) 7[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
UTG checks, MP2 checks.

Final Pot: t1095

Results in white:
<font color="white">
MP2 shows [ Ts Ac ]
UTG shows [ Ad 9s ]
</font>