[100nl] Deepstacked with underboat, stack off?

[Grinding2Ecstasy]

Villain is 27/11/1 after 200 hands. Check on the flop was accidental 16-tabling mishap, normally I would have led out a cbet sized bet.

Full Tilt Poker No-Limit Hold'em, $1 BB (9 handed) Hand History converter Courtesy of PokerZion.com

UTG ($68.45)
UTG+1 ($91.60)
Hero ($246.10)
MP2 ($155.15)
MP3 ($44.85)
CO ($44.85)
Button ($15)
SB ($53.65)
BB ($42.65)

Preflop: Hero is MP1 with 5[img]/images/graemlins/diamond.gif[/img], 5[img]/images/graemlins/spade.gif[/img].
<font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises to $3.5</font>, MP2 calls $3.50, <font color="#666666">5 folds</font>.

Flop: ($8.50) Q[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/diamond.gif[/img], 5[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, MP2 checks.

Turn: ($8.50) K[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $6</font>, <font color="#CC3333">MP2 raises to $16.65</font>, <font color="#CC3333">Hero raises to $50</font>, <font color="#CC3333">MP2 raises to $120</font>, <font color="#CC3333"></font>Hero - ez stack off?