Animate Guardian and rune enchant with overcap fire resistance doesn't seem to be working

I built a character all around the idea of giving as much fire resistance to my animate guardian and using the rune enchant that grants "7%-10% Increased Fire Damage Per 1% Fire Resistance above 75%". Now, I'm not that great of a build creator but I think I did well enough to realize that the damage that I think should be there is not there (I could just be bad). With that said, I have given my animate guardian over 500-600 fire resistance and gave him the axe and the damage doesn't seem to be there. If it matters, he also has 100% crit chance, 400 crit multi and the base damage scaling is mainly through 16 lv 27 pyroclast mines on the ground. I was wondering If the enchant on the weapon was even being applied to the animate guardian at all. I ended up testing if it was just because it was a rune enchant so I tested another animate guardian with a curse on hit rune enchant and it seems to work fine. The enchant "7%-10% Increased Fire Damage Per 1% Fire Resistance above 75%" gives no indication that it would only apply to players (like rathpith) so I thought it would be fine.

In summary, does the enchant actually do anything on an animate guardian.
Thanks in any case.

I am just bad. Thank you lol