As it stands this trait simply causes the banners to grant regeneration. Since regeneration only stacks in duration this effectively makes all other sources of regeneration useless or vica versa, not to mention having multiple banners out has no increase in effect.
Instead of applying a regeneration boon the health gain should be moved into the banners’ aura as it was during one of the stress tests. If the amount of health restored needs to come down some so be it, but as it stands this trait is nearly useless.