Since you mentioned this happens in other set ups you have tried the table with, it can't be the placement of your speakers then. Although that was my first thought.
So the only other thing I can think is to try a Pro-ject Speed Box II with your Debut if you don't already have one. I added one to my Pro-ject RM 5.1 SE and it did tighten up the bass - its now very fast and punchy.
Pro-Ject RM5.1SE, Phono Box S, Speed Box II,
Dynavector 10x5, Marantz PM-15S2, Arcam CD-17
Vienna Acoustics Bach Grands & Rel T-1 Sub