According to this:

(I can't post links; it's from the UESP Pacify page)

The base effect from Pacify is level 20 and the highest level enemy that I can affect with a single-casted Pacify spell and the appropriate perks (i.e. Kindred Mage+Hypnotic Gaze) is level 38. However when I hover over the spell in my magic inventory it only says level 28. It seems that the game is only giving me the +8 level bump from Hypnotic Gaze, but not the +10 from Kindred Mage. I figured that it was simply the text not updating until I tested it on a Giant.

According to this:

(I can't post links; it's from the UESP Giant page)

Giants are capped at 32. Theoretically, I should be able to single-cast Pacify on any Giant and have it last for sixty seconds. I single-casted Pacify on the Giant, however, and the game told me that the "Giant is too powerful for Pacify." I was hoping someone could help me out and explain what is going wrong here. Is my character bugged and I'm not getting the benefit from Kindred Mage, or are Giants capped higher?

Looking into it I've found that Giants are classified as 'Monsters' and also have a 33% Magic Resistance. Could the fact that Giants are classified as 'Monsters' allow them to negate the Kindred Mage perk since this only works on higher level People? If so then would that coupled with their Magic Resistance make them immune to a single-casted Pacify spell?

It should be noted that I've been able to single-cast Pacify on a Wispmother and, according to the UESP page, they too are classified as 'Monsters' but are level capped at 28. Therefore, I'm at least benefiting from the +8 bump from Hypnotic Gaze, which affects all enemies monster, animal, and human alike.

Ultimately, I think Kindred Mage simply doesn't affect 'Monsters' and said characters are only affected by Hypnotic Gaze since Kindred Mage only works on People. Can anyone confirm whether this is the case or not? It would be greatly appreciated.