At the very minimum
SCH: Add a new spell, called Vitriol (to fit with SCH's spell names having conversational double-meanings)
Vitriol would be an instant-cast targetted AoE (think BLM freeze) that deals 350p over 24s. It would require a Dark Humour stack to be cast.
Dark Humour would be accumulated by consuming Aetherflow aside from Energy Drain (so every healing AF, but no recitation). Casting Aetherflow would remove existing stacks of Dark Humour.
Dark Humour would overwrite the spent AF on the gauge, as shown in this sloppy mockup:
The purpose is to reward the cast of an AF heal with a damaging effect that cannot be spammed. You're be encouraged to chain Dark Humour stacks via Vitriol + AF Heal, while still needing to dump excess aetherflow with Energy Drain (since Vitriol is only once per 24s). Biolysis + Energy Drain is still a DPS gain though.