Tips for solo healing T8?

[Lyrinn]

We're consistently making it to about 15% with me constantly burning cooldowns and MP potions. All the videos I've looked up run double bard for near full uptime on ballad but we have just one who's also playing TP song half the time. Is running two bards recommended? Are there any videos I could watch where there aren't two bards?

It just feels like a mad rush of spam heals so it's hard for me to figure out where I can do something better.

WHM or SCH tips are appreciated, I've done both with similar results. I'm using Medica II or Cure III (depending on tower set) on WHM and Rouse + Whispering Dawn on SCH for defensive towers but it gets really messy towards the end (I think 7th set?) where we have landmines and a second defensive tower go off before I have everyone topped off. I'm aware that may need to change but not sure how.