JasonB: I have 3 Vorza cups and they all measured about the same. The stock setup calls for 2 shims on the crown gear side and with the stock cups this feels perfect. With 1 shim there is a tiny bit of play in the crown gear mesh which might be ok in practice.
With 1 shim and using the Vorza cup I couldn't get the diff seated in the bulk in a dry fit test. Just too wide.
I have the first diff completed now. I used 120 sandpaper on some glass and this ground it down quite quickly. I ground the first cup down to about 21.4. After assembly the internal gears felt a touch tight but the diff fitted in the bulks nicely with 2 shims on the crown gear side and none on the other. The crown gear mesh was perfect as expected.
Second diff cup I have ground down to around 21.5. Hopefully this will be the happy medium of internal gearing meshing nicely and the cup still being able to fit in the bulk without being too tight.
coolhandcountry: I explained the shortened length in my first post in the paragraph before the pics. Was there something specific you wanted me to comment on about the shortening?