Disc, Grievous and Mana Issues

Is this an issue for disc priests in general, or no? You are healing grievous, people are getting stacks, you are having sometimes to spam shadowmend, and you go out of mana (oom). And like every few minutes sometimes?

What the? Like is Blizzard just anti-disc with this affix?

Thoughts or solutions, bring them on. And yeah, healing holy is a viable solution, but how about one where you heal this affix as disc.

If you scan down the page there is a thread of grievous already with people putting their strats forward. If your not doing pride then grievous isnt an issue really. Its when pride hits that it gets tricky. But have a look down the thread page