units\Minions\HIghPriest\HighPriest03_Abilities.lua
HighPriest03HeroHealHealingWindBuffl01 gives 30% health on heal but rank 4 only gives 22% and rank 2 gives 17%.
Based on the pattern of Healing Wind and priest healing in general, it should have been 20%, not 30% (looks like a typo).
The fix is very easy, just change the 0.30 on line 68 to 0.20.