Say, let both morphs interrupt as part of the base skill. More healing with Essence and more damage on Deep Breath for the morphs.
Also agree, YandereGirlfriend, the requirement of a target on the first part does limit the burst potential of the skill.
I was also thinking of one morph getting a longer delay to the payload and instead it would receive a "while inhaled" buff, so that it could trigger the % healing passive by itself. That buff could be anything and the payload could be on demand by activation or attack trigger (HA or so).