Guess the only way to do wiz on t6 is to stack cd reduction and tick "use archon off cooldown" in trinity. You know, 20% cd red passive, captain crimson diamond in helm, 10 from plvls and also make sure you get cd red on shoudlers and anywhere else where u can sacrafice it for armor/ares i guess...
Also i believe double unity is a must as for gems i would pick wreath of lighting and maybe that dmg spread over 3 sec gem, or perhaps the one that gives bonus dmg based on distance...
Another idea copmes to mind to use disintegrate arcane build with 80% ms reduction apssive and that controll imparing effect 15%+ dmg leg gem but i am not sure which apssive i would like to lose... Maybe switch fire disint conflig for chaos nexus/slow passive.