Is Awakened Jadefire healing weaker than shown on tooltip?

So I tried hitting dummy exclusively with Spinning Crane Kick while sustaining Awakened Jadefire buff and logged them each time based on numbers shown on Details addon. Did it for 8 times and everytime I calculate out that Awakened Jadefire is only healing for ~72% of damage done, not 90%. Not sure if there’s something i’m missing or it’s been healing really weak so no one really use SCK anymore.