I know this post is old, but I thought I'd add to it anyway, in case it helps anyone else. I emailed Conrad Mas directly about this issue. He said to use a thin piece of felt, cut to fit the Acutus clamp (looks like a donut). I have been using this tweak for years. It doesn't negatively affect the sound and leaves no marks on the label. You can clamp the record down as tight as you want.
Avid Acutus Record Clamp leaving marked "ring" on record label
I recently purchased an Avid Acutus SP and the record clamp is marking my record labels with a "ring" from the clamping down to flatten the record to the resin platter. Are there any Acutus owners out there that have had this similar problem and how can it be fixed ? I don't like that the labels are actually being damaged and leaving a ring because of the clamps force directly into the label. Any help or feedback, or experiences would be greatly appreciated. Thanks !!