So the way i see it all Enhancements, Epic Destinies, Feats and Items that give PRR will also give MRR (for now).
so the Divine sphere Epic Past Life Feats will give you 27 prr and mrr which will give 16% less damage.
If you take Arcane sphere Epic Past Life Feats will give you 9% less damage.
my answer is give Arcane sphere Epic Past Life Feats mrr and take away the Absorption and take mrr from Divine sphere Epic Past Life Feats.