Problem solved…short story is the mounting bolts (30mm) that were shipped with the clockable adapter were bottoming out and not holding the adapter tight. Shorter bolts (25mm) installed..no movement now. Interesting the original Inchworm instructions I found online called for 25mm vs 30mm but Marlin told me the 30mm cleared on a set the tested in their shop. Not sure what happened, just glad it is done. More details here:
https://www.toyota-4runner.org/3671885-post213.html
Anyone that orders inchworm adapters…recommend you double check clearance…sounds likes this is not a typical problem…