My 2cents is that your head makes a bigger difference than the helmet or gogs. I have a massive (XXL had to go internet) helmet, of which plenty of people claim to fit Electric EG2s under a smaller size. Because of the way my head is shaped even the smaller EG2.5s are pushed by the brim of my helm down onto my nose.
I realize its no help, but after my recent experience I'm starting to think helmet/gog+face combo is as persnickety and user-specific as boots+feet combo.
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