I'm a bit of a noob with SNG, but I think a push is too aggressive here.

What's CO's range? To raise 99+, AQ+? To call a push say JJ+, AK.

That gives me 6(99)+6(TT)+8(AQ)=20 folds. 16(AK)+6(JJ)+1(QQ)+6(KK)+6(AA)=35 calls.

Of the calls I'm tying 17 (16 AK and 1 QQ), behind 12(AA,KK) ahead 6(JJ). Say we win 15/35.

EV = (860) * 15/(20+35) - for the calls by COwe win
+ (-800) * 20/(20+35) - for calls by CO we lose
+ 180 * 20/(20+35) - for the folds
= +9 T$

I haven't counted the possibilty UTG may call a push here. I like calling and pushing any non A or K flop.