Tried this out today, we used the three builds listed and an additional battery and warrior to cover our mistakes.
We got as far as the energy degen room without too much trouble, but at that point we took a wrong turn and found another area with health degen not mentioned in the guide. It turns out the reason is it can be avoided completely, which we only realised after clearing most of the popups and reached a point where the energy degen from the next room overlapped with the health degen. If anyone else ends up in this health degen area, just head back and find the path around, because we really struggled despite having a blood ritual and heal party on the extra necro.
The furthest we got was the area after the exhaustion + weakness where our EoE didn't kill all the wardens, leaving our SB tank stuck in an uncomfortable place with an expired second spellbreaker
One trick that might help is hat-switching to a superior beast mastery when laying edge, sometimes a bad lure will leave you with too few enemies for a full EoE bomb so any extra damage helps. There were several occasions where the initial EoE wasn't enough, spellbreaker ran out and we all needed to run like crazy.
The three man build seemed to hold it's own, we only really used the extra two for clearing up/running away when things went wrong. Even so, it took us two practice runs and 6-7 hours to get where we did, with two extra people and ventrilo. I'm sure with experience this can be done in a fraction of the time with far fewer deaths, many thanks to the guys who worked it all out, must have taken you quite some time to perfect it