This is an interesting discussion. My experience with dynamic vs. static is with the Grado arm. Joe Grado said that the best result was with 1/2 each or 1/3 2/3 (and I forget if that meant spring was more or less). My system back in that time was a VPI HW 2, Grado XTZ, AR SP-11, Rowland 5, Infinity RS2-b, not IRS status but yet still revealing. I could not hear the difference between the static and dynamic. I was not playing warps though. I believe in market forces and that if spring VTF was thus superior then all arms would have it. I also believe that the tone arm bearing type is more important than the VTF system. You can see market forces here as well... I think more than most top arms are uni-pivots, though this is not from actual sales figures by arm type, just a guess by all the words we all write and the types I see available in English speaking sites and magazines.
Peter
Peter