I wonder if the balaclava coupled with the plugs is just too much for the volume to get through? I'll try on the ride home today with no balaclava and the Surefires and see how it goes.Surefire showed up, I love them. I can still feel some pressure from helmet, but the are pretty low profile so I think that is as good as it gets.
By the way, I have Scala G4 and can hear even with solid plugs.
+1 on these.