I push here.

If you just call PF, you're giving two people to draw over your KK. If they both miss, they might not contribute any extra chips but a push PF would get a hand that you dominate like AQ to call you. With such a big raise from UTG+1 and a caller, it would be rare to see the raiser fold to your push anyway. If they do, you should be happy to pick up that huge pot uncontested.