PP 20+2 MTT hand

[MWC]

PP 20+2, 2000 started, 230 left, 220 paid, blinds 300/600

MP1 is new to table, no reads
Button likes to limp
Table is reasonably tight, my image is tight, except that I've pushed PF twice in the last orbit.

I post the BB (600) and have 6500 left
2 folds, MP1 (15K) limps, 4 folds, button (~5K) limps, SB folds, I check with K [img]/images/graemlins/club.gif[/img]6 [img]/images/graemlins/diamond.gif[/img].

Flop (2100) K [img]/images/graemlins/spade.gif[/img]5 [img]/images/graemlins/heart.gif[/img]2 [img]/images/graemlins/spade.gif[/img]
I check, MP1 bets 600, button calls 600, I push (6500), MP1 calls.

Thoughts on the push?