Good to hear about how happy you are with the PBS shifter. I'll look forward to enjoying it myself. I think the arc versus straight line movement of the shift pall is the source to transmission mod requirement. I think the angle of the pall slide is a little off. As in all things, when you did into the details you probably would find that they did the best they could considering all the constraints.
Thanks for the info on the shift knob. I have one on back order from Special Editions. The threads on the shift shaft were wearing a hole in my palm so I stopped by Auto Zone to a knob to at least cover the raw threads. I plan to use it on my lawn mower when I get the real one. Have a good week end.