betting into large pot on flop?

[bunder]

Party Poker No-Limit Hold'em, $0.50 BB (9 handed) converter

saw flop|<font color="C00000">saw showdown</font>

SB ($25.25)
<font color="C00000">Hero ($27.45)</font>
UTG ($62.15)
UTG+1 ($11.85)
MP1 ($27.60)
<font color="C00000">MP2 ($33.20)</font>
MP3 ($26.40)
CO ($19)
<font color="C00000">Button ($32.15)</font>

Preflop: Hero is BB with K[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/club.gif[/img].
UTG folds, UTG+1 folds, <font color="CC3333">MP1 raises to $1</font>, MP2 calls $1, MP3 folds, CO folds, Button calls $1, SB calls $0.75, <font color="CC3333">Hero raises to $6</font>, MP1 calls $5, MP2 calls $5, Button calls $5, SB calls $5.

Flop: ($30) 3[img]/images/graemlins/club.gif[/img], 4[img]/images/graemlins/club.gif[/img], 5[img]/images/graemlins/spade.gif[/img] <font color="blue">(5 players)</font>
SB checks, <font color="CC3333">Hero bets $15</font>, MP1 folds, MP2 calls $15, Button calls $15, SB folds.

Turn: ($75) 3[img]/images/graemlins/heart.gif[/img] <font color="blue">(3 players)</font>
<font color="CC3333">Hero bets $6.45 (All-In)</font>, <font color="CC3333">MP2 raises to $12.2 (All-In)</font>, Button calls $11.15 (All-In).

River: ($104.80) Q[img]/images/graemlins/diamond.gif[/img] <font color="blue">(3 players, 3 all-in)</font>

Final Pot: $104.80
<font color="green">Main Pot: $94.35, between Hero, MP2 and Button.</font> &gt; <font color="white">Pot won by Hero ($94.35).</font>
<font color="green">Pot 2: $9.40, between MP2 and Button.</font> &gt; <font color="white">Pot won by Button ($9.40).</font>
<font color="green">Pot 3: $1.05, returned to MP2.</font>

Results in white below: <font color="white">
Hero shows Kd Kc (two pair, kings and threes).
MP2 shows 6d 6s (two pair, sixes and threes).
Button shows Qs 2s (two pair, queens and threes).
Outcome: Hero wins $94.35. Button wins $9.40. MP2 wins $1.05. </font>




my main question here is the $15 bet after the flop. play has been pretty passive with very little reraising before or after the flop, but even with the 4 callers i'm 96% sure i'm way ahead on the flop. any comments about my play are much appreciated, but my main question is whether to push, pot-commit myself, or make a smaller bet on the flop. thanks.