I recently achieved Immortal for the first time this act. I had 200+ rr before the patch. Yesterday, while playing on the new patch, I realized that I am now losing 30rr per loss but only gaining 20rr per win. I assume that this is because...

What's a good Average Combat Score to maintain in the Higher Plat elo? I'm a platinum 3 player getting gold players as my teammates and platinum 3 players as my opponents.