Barrier as a mechanic has never made sense to me. Some classes need more healing than others, that's fine. That healing should be integrated into healing skills, regen, etc. I think removing menders amulet would be a good first step, but it doesn't make sense to me how certain barrier savvy classes can "over-heal" themselves by so much. I believe barrier should not be shareable. It should only affect the caster. If barrier was supposed to be scourges form of shroud, then make it only effect them... and tone down how much is applied
Edit: Why is Blood Bank a real trait???