Haven't landed on 21 for ages, didn't know there was a new procedure. When did it come in? From what I remember of the old procedure, the descent had a "step-down" in it, although it published a nominal glidepath angle. If you started the descent at the descent point and went down on the standard (steep) approach, which also followed the PAPIs then you would come very close that hill. It was fairly easy to miss the fact that you had to step down until past the hill, then continue down (at an even steeper angle) to get back on a decent angle of glidepath (equivalent).
I need to see the plates though.
Have you double checked that there isn't a short level off? Perhaps they missed it off?
When did the new plates come out?