It has since been generally agreed that the XV-1s performs best at around 2.1g VTF.
I don't know where and by whom this agreement was made and under what conditions. Would you folks tracking a 2.0+ VTF please mind stating what arm you are using the V-1s on? I think it would help clarify some of the differences that are being reported. It sounds like the SME and Triplanar users prefer a much lighter VTF.