It’s exactly 16% for me if I don’t crit, but it depends on a lot of variables.
Here is my post in the beta forums:
https://us.forums.blizzard.com/en/wow/t/massive-nerf-to-spirit-mend-in-sl/632016/26
Somebody posted some tests last week. I stumbled across them while I was looking for something else:
https://www.youtube.com/watch?v=u96BEaJ7FZg
Survival of the Fittest has nothing to do with Spirit Beasts. Besides that, I’m not really sure where this is better than having BL and Leech. Jeeze. It’s no comparison.
I hit the wrong reply button. I was talking to the OP.