Anyone NOT like the sound of VPI?

Madfloyd,
What speaker were you thinking of changing to? If you don't mind the suggestion, your system seems to be almost tailor made for a pair of Vandersteens. The Quatros and 5As both incorporate powered base modules with room correction EQ. I use the 5As as does Stringreen which may explain why neither of us complain of low frequency problems with our VPI tables. You have a good table(I didn't say the world's best)and should be able to get very good results with it. Audio Research and Theta(citadels in particular) are widely reguarded to be great matches for Vandersteen. Just one idea from one guy who's happy with his system.

Your bass response issues being resolved by the digital makes the tt setup the obvious culprit. Attending to other issues will only delay your getting the tt setup right.

The wall shelf will make little or no difference in the bass, I've tried both wall and floor setups, the wall setup is much better overall in other sonic aspects. I suspect the fact your setup sits on a cement slab will make even less difference vs. the wall setup. I highly doubt it is your tt isolation.

I had the Pro-ject Tube box in a former tt setup, I doubt that is the culprit. I actually found it to be somewhat dark sounding in that setup, it probably doesn't have the bass impact of the highest quality phono stages.

You may also want to try an armwand with the standard Discovery cable, more even tonal balance in my setup. My only problem with that cable is it seemed a little closed in on top, it also doesn't have the resolution, air and spaciousness of the Valhalla cable. I also think it may be worth considering a custom wired armwand with Cardas, Purist or some other wiring, this could make a worthwhile difference. The Purist will definitely take the bass up a notch.

It would also be enlightening to audition a higher end phono stage, I've tried this path with no success to this point. Based on my experience you may have a long road to go in getting the VPI to sound the way you want, on the other hand, perhaps the next upgrade and/or tweak could solve the problem. Kind of exasperating not knowing how far or close one can be to solving audio problems.

The SDS should be your next purchase. They're commonly available used here for +/- 700.00, and will have an immediate, and positive effect.

As an experiment, try using carpet thread instead of the rubber belt from your motor assembly to the platter. Helps to tighten up the musical presentation. Do a search at
VA for different knot-tying methods.

Johnbrown, I have the SDS and converted to thread drive. This did not greatly change my perception of a relatively lightweight bass. YMMV

Madfloyd, I sort of missed it, but you're wondering about the Rega. I formerly had a Rega P25 with Grado Sonata, Sumiko Blue Point Special, ARC SP9 MKII, Pro-ject Tube Box, always thought that bass somewhat lightweight as well. The Tube Box improved that deficiency to some extent, in the end I blamed the tt.

I also currently have a highly modified Thorens TD160, this does give me a more satisfactory tonal balance. Unfortunately, it not in the same class as the VPI in the resolution department. Still, I would describe it as more musical than the VPI in it's current state.