Have a VPI Classic replaced the feet with Bearpaws from Eden Sound and the results were improved midbass and focus. Have only positive things to say about the upgrade. I also have my turntable on a 3 inch mapleblock. Our you sure your feet are tight to the turntable. The Bearpaws were threaded to fit correctly which they do. Keep searching you will find the problem. Good Luck.
VPI Classic---replacing stock feet: my experience
Anyone considering using heavy brass footers to replace the stock feet on their VPI Classic may want to think twice. After reading about this being a "major upgrade", I tried it. Well, not only did it not make any sonic improvement (whatever that was supposed to be), but the brass footers had the effect of amplifying the sound of the turntable's motor. A constant and distressing low, pulsating hum was introduced just below the music, and it was particularly obvious during quiet passages. Any anticipated sonic improvement, had it manifested, inevitably would have been rendered useless by this motor hum. My VPI Classic sits on a Mapleshade component rack with 2" maple shelves, with nothing between the footers and the top shelf, so YMMV.