Replying to Bindings and butters

My bindings pop out easily when I do some nose presses on flat ground and because of that I always hesitate to work on nose butters because I don't want it popping out mid-turn or something.

I'm 5'9" 140 lbs, front and back din is set to 5 on salomon z10s.  The thing is they always stay on when they're supposed to and they always pop out when they should.  I had a bit of a scare a while back and the whole time I was thinking "please pop out" and it did. 

What should I do to remedy this nose pressing problem?