Hey guys whats happening?

Ive been playing some rush poker and trying to work on some deep stack play as seen in the latest 6max rush vids by marshall28. I feel uncomfortable with my deep play and would like to post a few more-than-likely standard spots that i'm still not sure about.

First up a weird KK hand no hands/reads on villian(MP2) some very loose stats on MP3 over small sample
-I flat MP3 here as i believe his range is quite wide, planning to raise/stackoff on any non A flop.
-MP2 4bets MP3 folds which puts me in a pretty ugly spot this deep....thoughts??
-Cold 4bet anyone?

Full Tilt No-Limit Hold'em, $0.50 BB (9 handed) - Full-Tilt Converter Tool from FlopTurnRiver.com

SB ($54.75)
BB ($14)
UTG ($35.95)
UTG+1 ($15.95)
MP1 ($67.80)
MP2 ($100.65)
MP3 ($136.50)
CO ($49.20)
Hero (Button) ($113.95)

Preflop: Hero is Button with K,K
3 folds, MP2 bets $1.75, MP3 raises to $6, 1 fold, Hero calls $6, 2 folds, MP2 raises to $17.50, 1 fold,Hero ????