Having difficulty installing Grado cartridge on a Rega turntable


I'm trying to install a new Grado Sonata 2 cartridge on my Rega RP3 turntable. I'm replacing the Grado Sonata 1 cartridge which was installed by the dealer who is now inaccessible. I understand Rega and Grado are somewhat incompatible. I'm having all sorts of problems installing the new cartridge and need help. It doesn't behave like the old one.
Does anyone know of a Rega service person in the Long Island, New York area?
128x128rvpiano
there are much more variables on sliding over the label at the end of playback:

1. horizontally leveled turntable position
2. anti-skate
3. VTF

seems like it's already been done LOTS of trial/error and indeed professional help is desirable to stop 'torturing' cartridge, arm and records.

I had a Grado Sonata that I was quite happy with, now I've got a Grado Master with my Rega, and I couldn't be more satisfied.

Good luck.
" The stylus is bent off center.  I'll have to return it."

Bent how? What exactly are you seeing? (There's a reason I'm asking.)
Not sure about Rega but American Audiophile in Lynbrook is familiar with Grado.