Here's my ha penny's worth.
Basically if your getting pegged when your peeking out and checking out the situation, we're talking about two things :
Either your not playing tight enough ( playing tight aslo covers sneeky peeks not just snap shooting and keeping your opponent in )
and/or your taking too long to have a goosy gander.
Killer O has it right when he talks about having the marker up and aligned with where ever you're looking - but I would also take a trip back to basics and do some drills on staying tight.
Have a team mate lie down in front of your bunker and watch you as you practise taking a peek/snap firing etc. He'll be able to give you tips like - elbow sticks out a bit/slow on the snap back into cover/you're looking to far out with your face trying to watch where your paint lands etc.
I think whether you wear a peak on your gogs or not won't really matter, so long as you play tight, and keep your sneeky peeks to a bare minimum. Hopefully after some practise you'll see the number of eliminations drop off.
hope this helps