the screen you are looking at cant seperate out crit direct heals from crit hot ticks. to get the numbers you are looking for just click on regrowth in your list of heals.
the screen i linked shows the info you are looking for.
as far as living seed being consumed on a massacre, i dont see why it wouldn't. it is a damage event. i'll keep digging around and try to find a log showing LS being used after a massacre.