It's really hard to make a channeled spell like this work on a healer class. At least with the current range it has. If it was a medica II sized radius it could work well as is in diurnal (maybe slightly more potency, but not sure if that would be necessary). Basically it would be like a Druid's Tranquility from WoW. Though noct stance would need a change beyond radius if it remains a channeled spell. Maybe double its effect.

Tbh, I think the easiest solution would be to just let you drop the bubble ala Destiny.