I have a VPI Classic and am currently usisng the Stainless/Delrin clamp/wt with the supplied rubber washer. I had the opportunity to use the all stainless HRX wt and outer ring clamp. In regards to increased tracking ability by decreasing "warpage" they performed about the same. (I'm using a Benz ACE S which tracks pretty well already)Where I noticed the biggest difference was greater detail retrieval ie low level info with the HRX wt and outer ring clamp.(The SAME amount of increased detail retrieval on both warped and nonwarped records) I attribute this to better overall damping of the lp.
Thanks, John