Flying spice, Get those papi's switched off if you can.
papi's in general are not for light aircraft use. The reason and there seems to be some confusion here, is because they are calibrated to take you down to the touchdown point on the runway not the numbers. If you want to land on those big white rectangular markings further up the runway then the papis will take you there however you should be aiming for the numbers with your mark one eyeball. To be honest your instructors let you down here.