Same here curious what you are you doing at end game, and what your heals are ?

In regards to your ideas, they need to be revised, you have to remember SCHs need to well geared to match WHMs of lower equipment on HP heals alone, not talking about skill before you say. Schs match them also by being able to throw out heals constantly, and they need to due to the lack of big hits WHM can.

If you want to dampen or entirely remove SCH mp regain you will need to re address SCH and WHM lvl 50 base stats traits included. Reduce GCD of EOS buffs to be in line with WHM, and give them there own refresh skill. You need to remember WHM has a lot of tools SCH doesnt have like CC, targeted regen, stronger base shield + stone, buffs and 100% instant heal, plus the fact end game gear is tailored to WHM needs not SCH.