Not the first time this video has come up, but it explains how crap instructors are teaching very large circuits and flying PAPIs all the time, which isn't always appropriate for light singles
I would always expect 3 whites on PAPIs in a light single, if not four. The PAPIs are aimed for a 3 degree approach to touch down on the ILS touchdown zone, I'm actually aiming to fly a 3.5-4 degree approach to touchdown on the numbers, so the PAPIs aren't showing anything relevant at all. This is what the second instructor for the OP is trying to get him to do.
sevenstroke(t)roll you're talking out of your arse