Update: I have run a number of 4x8s missions on Brainstorm working my way up to an ITF. Y'all had me nervous and I started on 2x8 but it was a bit comical.
No inspirations needed and avoiding using Instant Healing except in very rare 'oh sh*t' moments.
Using Stone Melee and the knockdowns help but aren't required to stay upright.
The build (accolades, no incarnates) is not super dialed in, but cycles Heavy Mallet, Gloom, Seismic Smash with a bit of a gap every other cycle to sprinkle in Tremor.
It just works its way through mobs.
Found myself pausing in front of 3 Hercules & 2 Zeus Titans. Their -regen was there, but just not enough to cause a crash in regen. I was comfortable enough to try different toggle combinations. (2 Sappers though, different story).