Guardian Aura effect Ascendacy

Hello. I have question!
I have purity of fire 23 lvl. +5 max res.
i need 10% non curse aura effectivnes to make it +6 max res.
Guardian nodes gives 10% aura effect. - it doesnt work.
10% aura effect from Tree gives +6 max but guardian don't work.
I dont know something?

?

You need 20% increased effectiveness. 6 is 20% more than 5.