Synergies auras

Hello, i have question about synergies and+skills. I see i have fire resist at max 20 pts, and when i put spirit, +2 all skills and my fire resist aura become 22 lvl, there is no change in holy fire dmg, so synergies from 20+ dont count ? so my +skills only affect my holy fire aura dmg from holy fire aura spell and no synergy from any more point in fire resist aura than 20+ ??

Only base skill points invested in a skill count for synergy bonuses to another skill, to a max of 20 points.

Bonus skill points, from gear and battle command, will only effect the active skills, synergies do not benefit from them.

https://www.theamazonbasin.com/wiki/index.php/Skill#Synergy_skill