With my Celebration, it sounds best - by far - loaded at 1k. 47k sounds nice and fine; 100 ohms sounds decent too; but 1k is special. (My previous XONO and current Joule OPS I can choose almost any value, and have......)
The cart also seems to send the arm a little mechanical feedback. I had to add a dash more fluid to my Basis Vector's tray to settle it down. I only heard this feedback on HIGHLY modulated grooves (think big symphonic climaxes, crescendo's). Now, regardless of inner vs outer groves, loud or quiet, BIG ensemble vs solo voice, it just sings delivering the goods bigtime (the Basis tt, with Vector arm has a little to do with it too :)
The reason I mention all this, as the SME V/IV can take that mechanical energy. I am not sure about something that isn't super rigid, and undamped, say like a unipovot Graham (or your VPI 9" unipivot perhaps). Undamped unipivot's might not make the best platform for this MC cart. Now, I do not know how the VPI works first hand with the Celebration, which is what you asked!, but a previous Graham didn't fair so well...... you may want to think about a SME, or Vector arm if things don't work out. (if I were you, I think I would give the Celebration/JMW combo a go, just out of stubborness and maybe hoping to get lucky, as the sound and presentation of the Celebration is that unique - just knowing the JMW/MC might not play nice and easy together)
