"Minion deals #% increased damage" at Runesmithing table does not work with "Spiritual Aid"

I'm playing as a RF Chieftain, and I took the "Spiritual Aid" skill tree node because I noticed I can craft "Minion deals #% increased damage" to the scepter at Runesmithing table.

I checked the RF damage in the tooltip before and after I crafted "Minion deals #% increased damage" to the scepter, and the numbers do not seem correct to me.

This is what I did for my testing:

I have the "Disciple of Unyielding" in my skill tree. I have 1 minimum and 5 maximum endurance charges. Each endurance charge gives 8% damage increase. In idle, I have 1 endurance charge and my RF damage in the tooltip is 306,168 per second. Once I have 5 endurance charges, RF damage in the tooltip is 333,966 per second. So basically 32% damage increase from these 4 more endurance charges grants a 9% overall damage boost. I understand that since increased damage is not the same as more damage.

Now I crafted "Minion deals #% increased damage" at Runesmithing table to my scepter. I got "Minion deals 32% increased damage".

Now, in idle, I'm expecting the RF damage in the tooltip to be 333,966 per second as well, since with "Spiritual Aid" skill tree node, "Minion deals 32% increased damage" should be the same as the 32% damage increase from 4 more endurance charges. But the RF damage in the tooltip is only 318,523 per second, a 4% overall damage boost.

TLDR, 32% increased damage from 4 endurance charges gives RF 9% overall damage boost, but 32% increased damage from minion damage increase with "Spiritual Aid" skill tree node only gives RF 4% overall damage boost.

Something is off here. Am I understand anything wrong here?

I'm fairly sure it works right I used it on my RF and it seemed fine thought I didn't test it extensively but at any rate it's just 30-40% increased damage that's fairly free so I wouldn't worry too much about it.

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CozyGoose wrote:

TLDR, 32% increased damage from 4 endurance charges gives RF 9% overall damage boost

You shouldn't get that much, maybe some other conditional damage comes into play when you generate endurance charges?