That's astounding--the UE page says they provide up to 32db of sound reduction; and that wasn't enough to reduce the ambient sound from the speakers and other monitors to non-hearing-damaging levels?
I feel sorry for the patrons of the venues you played in. I do care about my own hearing, and I hate it when I forget to bring non-distorting attenuators of some sort to a place which makes a goal of preventing conversation even in shouts.