Grevious Wounds NOR Adaptive Helm Work as advertised

So, I've done about 12-15 hours total time in custom games carefully observing the damages done, healed, and reduced.

Contrary to what they are advertised "Grevious Wounds" actually reduced healing by only about 12.86%.

While Adaptive Helm effectively did nothing at all. I've got about an hour long video I'm uploading currently and will post.