When you say 'handling pilot', you mean Pilot Flying? PIC/US is not supposed to be used for that. That time should still be logged as co-pilot (p2). PIC/US simply means you are acting as Pilot In Command - captain duties, properly supervised of course. You don't even have to touch the controls to still be PIC in a multi pilot A/C. Bu hey, if it got you the time in your logbook and it was signed by a Captain then job done!