As a mage player, I haven't played Profko in previous version nor have I experienced the damage. But looking at the concern and a fix for the concern.
What if we just lock out the rhodium + bifrost rings -> Mage BF Rings until later down the road (When people can craft BDW elemental rings, or a closer to BDE elemental rings)
Once more people have the BDW elemental rings release the rhodium + Bifrost rings for mages to be on even playing field again.
(Once again this is a rough idea IF the mage bf rings would be considered too overpowered, because we dont know how much more damage Flame rings will give and if there will be a major impact)