According to Kale, the magnification ratio without element will remain the same. So unless they change the formulae, this will not change.
Not sure the exact effect of spiritual reinforcement, it says 15% at mastery but not 100% sure what that means. If you take it at 15% of attribute then it will do little. 15%*3=0.45 so that would be a 1-2% damage increase. Knowing SGi there may be some MA dependance. I guess I may have to test this later unless someone else wants to do the math.