I finally made it to the level 60 on all characters.
It's pretty awesome, haven't had time to try ACT2+ but it's not because of the group, just too busy.
ACT1 is just a joke, I can stay in the explosion and lava of elites with life not going under 90%, DPS is just insane as you said, and I just realized that I've put Mantra of Retribution instead of Mantra of conviction which will be a huge DPS increase as well.

Thanks very much again for your help, you've made my 4 licences and second screen buy worth it !!

cheers