WHM toolkit suggestions and changes (PI and Lily)

[EaMett]

I guess I should clarify here.

Multiple things come to mind here. I think first and foremost what I want to say is that it's no surprise that players manage to put PI to good use. This doesn't mean it isn't counter productive to the class though and couldn't be replaced with something more in line with highlighting the WHM toolkit rather than shutting down one of the biggest issues behind medica II which is improper leverage of the HoT's potency. I'm going to go out and a limb and say that your hots in the very fight you describe probably overheal a good 40 if not 50% on that first section. This actually makes me think that [spirit consumption] should use anything above 50% potency of remaining hots to be an effective tool.

Now with that in mind, all your front loading needs could be met with [spirit consumption] above. This would just require a means of generating a lily early on. If you keep potential thorn mechanics you may decide to heal the entire section differently as well.
Also sounds like you're taking most of the healing burden by yourself in your examples. You shouldn't have to use a single GCD on that last add phase. Medica II as he punts everyone and asylum should be enough. Hots and shields alone cover the first intake and indom/star and potential assize deal with the second hit. Third one can be healed after he dies. Actually the entire first phase through adds should probably only require about 1 gcd per healer (during sections where you can dps, not talking about out of bound casting). And that's without considering PI and with a GCD that can be swiftcasted.. It's just that WHM doesn't have much in the way of weaving atm.

To respond to the thorn concern. It would only trigger on damage that does not kill the target. And only on actual damage applied (after shields). Your min-maxing would come in multiple forms. Potentially sacrificing a gcd to set the mechanic up, omit some forms of shielding in exchange for others. maybe everyone takes the dadaluma bleed because chain cure III is more dps efficient than current strats.
I'm not saying there isn't much to take into account. But with relatively low percentages on stacks even the cheesing aspects shouldn't make or break a fight. It might mean WHM is absolutely meta for speedkill in -some- encounters. But that would be amazing since it currently isn't even considered. Somehow I don't share the balance fear you have for this mechanic. Especially not with the current PI timer. Most of the time, at low % of 1 3 5 or maybe lower this would probably only express itself as added (well needed) pdps/rdps from the WHM.