I have also a strong machine, but i can say that it is really really light, compared to other routines.
I think that it's a bit too conservative on mana in emergency situations. Never goes under 90% of mana, and while with the majority of mobs it's a good thing, and i really, really love the logic, when there is massive group damage the Routine seems to don't react in the right way.
For example, a lot of times, when he takes really high spikes of damage, the tank just dies with me at 100% of mana, while the routine heals calmly like it's not an emergency.
I'm not a CR developer, but it seems to me that when too many ppl are under a certain hp% the routine logic just don't know very well how to reacts, and it reacts a bit too late.