totally fine to stack SE and QL as far as i can tell. maybe saint will slap me wrong but otherwise, you should be fine.
sanguine: elixir has been one of the best, easiest to run titles ever, and The Elixir was originally meant to enhance the healing of other titles, or add topic-specific healing to the non-healing titles.
Elixir + Regeneration… elixir was made specifically as a booster to regen,
so yes, i think it’s okay to stack with not just ql, but ANY healing sub, if you’re up for the challenge or if it makes the experience smoother
in my experience, sanguine elixir has helped me heal the blocks stopping me from executing on HOM more fully