Je_pense,
This is kind of a stab in the dark but...
You might want to check on the underside of the armtube to see whether there is a tiny screw for adjusting the headshell mounting collar. That tiny screw exists on the PX-1 and I think also the PX-2. If it exists, by loosening it, you should be able to shift the collar in the tube and therefore solve your azimuth problem. On the PX-1, the whole armtube can be removed, and I thought that was the case with the PX-2 but it has been a while since I played with one. I honestly don't enough about the PX-3 to say.
This is kind of a stab in the dark but...
You might want to check on the underside of the armtube to see whether there is a tiny screw for adjusting the headshell mounting collar. That tiny screw exists on the PX-1 and I think also the PX-2. If it exists, by loosening it, you should be able to shift the collar in the tube and therefore solve your azimuth problem. On the PX-1, the whole armtube can be removed, and I thought that was the case with the PX-2 but it has been a while since I played with one. I honestly don't enough about the PX-3 to say.