You shouldn't need to cleanse that fight.
If everyone runs behind a boulder while he is reforging the stacks go away and start again

And yet, they never do, even when asked to which leaves you in the middle rolling your scroll wheel on them while they keep up MaxDPS on him.

I find I can work through DPS lack of sense/desire to top recount if I havn't needed to blow my bubble on the patrolling drakes before the fight. I can then blow it during Garfrost and catch up.

500ms lag blows some times.

You could just use frost resistance aura. Using it or the totem generally causes at least 1 out of 10 of the applications to miss and reset the stack.

That's what is weird, I am good with my situational auras, Things like the ramp up to the tunnel or the run through the slag in HoL or the many mobs using shadow are so easy, yet even with my frost active there never seems to really stop them.

With you saying that I am thinking that it is a totem like range issue (I also have level 80 RestoDruid and RestoShaman) and that I am just not near enough to them all. Cleanse and run with the group during that pushback is just beyond my skills so I tend to stand still in the middle, that probably is putting them outside my aura. Something to try the next time it pops; stop all cleansing and move closer to the group.

Somedays I think we all have one nemesis fight, this one so far is mine and only on my pally. I can heal it on every other class I have without even raising a sweat.