I recently had a Vivaci treatment and am scheduled for 2 more. The operator made only 1 pass over my entire face using a non-insulated tip @ level 6, 1.8mm and 600ms rf time. I was told that the next session would be using higher numbers. In any event, should only 1 pass be made on such things as rolling and tethered/anchored scars or should more be done (per treatment session) for best results? Thank you very much.