GridStatus Lifebloom is what I use. all I care about is whether I have a stack up on the tank, and this does it for me. I don't care what other hots are on, overhealing is not a factor.
Of course, grid is a prereq for this one.
Settings for Grid that I personally use:
Top left corner is Aggro meter. This shows a red dot when the target has aggro.
Lower Left is incoming heal. this shows a green dot when the target has a heal being cast on them. this does not count hots at all.
Top Right is Lifebloom. This shows a red dot on a single stack from me. Yellow on a 2 stack, and green on a 3 stack.
The center text shows the Lifebloom timer. this is also in the same color scheme as the stack dot.
Center also shows Rejuv or Regrowth icon, but this covers over the lifebloom timer, so I use NECB for the timer when I have something else up on the tank.