My guild killed it on patch week, we had immortality going up until that point... we wiped several times due to either tank deaths on add tanks standing 2 close together and because of the massive healing he does. It is much harder due to the loss of MS, we did not stack MSes.. but we do have more dps. The real problem is everyone looks at health bar percentages while healing and when keeping people low keep them above that percent. Now that we all have much more health that same perentage from before is alot more health. Basically just heal less, due to loss of MS you can't really power through his healing anymore otherwise.
He who is afraid to lose will never win.
Only when the power of love overcomes the worlds love of power, will mankind know peace.