Hi David,
Good to see you here.. I have the RF9 on my TTS-8000 at the moment, alongside my SAEC WE560, which has been a favourite for some years now. The ViV RF9 has been a very interesting exercise though, debunking the tracing error theory completely, and demonstrating what a tonearm without any bias application is capable of. As you'll have heard via the 7, there is no distortion at LP extremes, even almighty crescendo's or powerful female vocal's at the inner groove will not upset the tracking. I have used the RF9 with the Aidas cartridges, from the £2800 Rainbow Malachite in the Nasotec Swing headshell, up to the top level Mammoth Gold Mkii at £7,700 in the Nelson Hold headshell. The Mammoth Gold I could not achieve top performance for some reason in the swing headshell, but the ViV headshell works wonderfully. This all run through the RCM Theriaa Mkii and Mayer 10Y Silver or Concert Fidelity 080LSX2 at present. So I think headshell experimentation is applicable here as per usual. You are always welcome to call by if you are in the area anytime..
BR,
Paul