As an aside, in my first post in running the math found here:
https://www.project1999.com/forums/s...&postcount=416
I was assuming a level 56 shaman. This would imply use of Canni III. When I later flexed to accommodate DSM's specific parameters we were discussing a level 58 shaman hunting 7khp mobs. I never adjusted for Canni III being less efficient and giving about 10% less mana returns compared to Canni IV.
So let's give the shaman not using JBB 10% greater mana returns on regen hp recovered (and thus converted to mana).
https://www.project1999.com/forums/s...&postcount=430
Instead of 720 surplus mana from Canni III, You're looking at ~800 mana from Canni IV. This leaves the 58 shaman not using JBB with closer to 300 mana surplus net at the end of the fight @ 188 seconds. This is more than enough to compensate for the slow/root from each fight and more or less all buff refreshes required over the course of the xp session (pet haste/regen, self regen, etc).
Sorry for overlooking this earlier.
EDIT ADDENDUM: All of which supports my previous posts (most recent here:
https://www.project1999.com/forums/s...&postcount=410 ). A notion which DSM said was factually false and could be disproven with napkin math.