Currently at GR75 (no-death runs around 14-15 min) with my DMO Arcane Orbit Wizard, with 1200ish paragon and quite nice gear (not quite perfect yet, but not that much missing on each piece and at the point where I don't expect to wake up to an upgrade in my stash)
COuld probably set the bot to attempt GR76-77 with a lower completion rate if I wanted to push gem upgrades a few levels, but the limiting factor atm seems to be the bot itself (slow time placement, not always moving in melee for AO, sub-optimal EB stacking, avoiding things that it doesn't need to avoid, ...), I'll have to see if I can improve it sometime (either through trinity settings or some custom code)
Trinity settings for these runs were trash pack 6 in 10 yards, ignore minions and most avoidance set to only avoid between 25-50% HP. Next test will be to increase trash pack size to see if elite hopping is still more efficient at near-80s levels.