Your symptom is as close a description of what I have experienced over the last 20 months as I can find for a mild to moderate rest tremor that is mostly felt but not observed with 90% unilateral rest tremor in the left leg and arm (but not hand). Movement specialist neurologist believes I have mild ET, however another movement neurologist thinks enhanced physiological tremor. Medically unresponsive to Primidone and Propranalol. Just wondering how you are doing as it's hard to find much literature on similar conditions.