$2/180, QQ FT Bubble

[iwannawon]

This is probably simple for most but i've been second guessing myself so i'm hoping someone will help me out. 10 left, 5-handed. chip leader had roughly 45k. the 2 shortest stacks are on this table. i think i'm 6th. hand wasn't saved for some reason so this is from memory. stacks altered from previous hand. the table was playing very passive. big stacks weren't pressuring, often letting the shorts play their blinds. With little aggression, the limp didn't look out of place. was often enough to keep sb out.

Full Tilt Poker, $2 + $0.25 NL Hold'em Sit n' Go, 500/1,000 Blinds, 125 Ante, 5 Players

BB: 27,294
UTG: 12,454
CO: 25,214
Hero: 16,128
SB: 13,840

Pre-Flop: (2,125) QQ dealt to Hero
UTG folds, CO calls 1,000, Hero raised to 3,000, 2 fold, CO calls 2,000

Flop: (8,125) Kxx (2 Players) {low, i think 7,4}
CO checks, Hero bets 6,000, CO raises all-in

After limp, should i have pushed? I thought it was enough to get the job done. pf, i put him on a mid pair where he wouldn't mind a cheap multipot. i thought a stronger hand would raise with so many behind. i wasn't happy to see the K but didn't think it helped him. my 6k bet commits me but, as before, i thought it was enough to win the hand. should i have pushed here or would i only be called by a better hand? is there a better series of bets so i know where i am or am i too short for that? thanks.