I haven't had any MP problems healing the delta raids as a SCH thanks to lucid dreaming, aetherflow, energy drain and deployment tactics with adlo. I can post a screenshot of ACT but I am constantly above the WHM in Encounter HPS with low overhealing in my PUG last night. Stats look some thing like

WHM 1.5m EncHPS 50% Overheal 1800 DPS
SCH 2.0m EncHPS 25% Overheal 1700 DPS