Your arm is 10-11 grams according to vinyl engines specs.
https://www.vinylengine.com/library/sme/series-iv.shtml
About the same as my VPI 3D arm which sounds glorious with the ART9.
Technically if if you go by the calculations, you are slightly below the line for resonance but it’s difficult to know for sure because of the 100hz spec that AT provides.
If you’re worried I’d use the lowest mass mounting hardware you can find.
https://www.vinylengine.com/library/sme/series-iv.shtml
About the same as my VPI 3D arm which sounds glorious with the ART9.
Technically if if you go by the calculations, you are slightly below the line for resonance but it’s difficult to know for sure because of the 100hz spec that AT provides.
If you’re worried I’d use the lowest mass mounting hardware you can find.