I misread the blinds i thought they were 200-400
now that i see they were 100-200 I would make it 600 to go, and fold to a raise.
with blinds 100-200 the bigstack can loose 1/2 his stack if u have a good hand. With u raising utg u could have a strong hand.
IMO push is not that bad, but raise and fold to big stack would be a much better play