Just give a positive boost on gl to those killing mobs in this map.
And a -negative boost to overall gl to those skip them , like the counting thing...
New arcane ring looking good to me, only change if possible the 15%gl and put some armor and little elite damage .(mobs and boss weapons should buff...
I have never used mythic zaa set, on expansions I stayed with 71 and 76 equipment and only buy both mythic weapons , with my bd I never had problems...