As stated above, a solution would be to add an option to hide only your helmet and those of your clanmates This way PVP stays balanced.
But if coding this crap delays actual good updates and content additions, then you can always use a helmet you like and disregard stat optimisation. You are most likely a roleplayer, so why would you care about those 200 extra armor you get from the helmet? Just wear the God-Eye or a Bandana (or no helmet at all). Transmog is for MMOs, not for survival games