You can already spec into this effect as a merc/mando- or do you want to take away a unique facet of the healing tree?
so? they should make static barrier make you uninterruptable with 5 stacks and cant be force charged (it would be like a small cover system). Concussive charge, should root instead of slow, and return the knockback to stockstrike with root. and then needs a slow somewhere as a base line skill, like gunslinger, and gg the class is fixed.