I've been taught the same thing as Iain, and it works well for me too. Well, normally - had a definite
:o on a glide approach recently. Still, reassuring to know that you can thump a PA-28 in that hard without breaking it....
I also wouldn't bother worrying about the PAPIs. I'd find them more of a distraction than anything else. Just make sure that the airspeed is correct you're not obviously high or low and a small adjustment in power is all you need to get things sorted out.