Hi Braro,
It's interesting that your preamp had that affect. It would have been my first question anyway. You may want to try some other options in the tube arena. For cheap $$ the PSE HL-1 was always a good match...especially with upgraded tubes. The Aesthetix gear is fun too. In any case, I wouldn't run the Wadia direct because of how they do (or, I think they still do) their volume control in that unit.
The only other suggestion I have is to try all Audioquest wires. That way you'll know what the components are doing...using different cables ends up like using tone controls.
Good luck, you should be able to achieve what you want without a lot of hassles.