I think the first thing you have to ask yourself is whether your tt is sensitive to what it sits on. My Linn was extremely variable depending on shelf material, while my Basis is not. I don't know what your table sits on now, but try a different shelf material like glass or corian or whatever you have and see if it makes a significant difference sonically. That said, I truly do not believe one can predict whether they will prefer one shelf material over another without trying it. There are just too many variables to make a blanket statement that harder wood does X and softer does Y.
And even if you could predict, that doesn't mean you would prefer it.
And even if you could predict, that doesn't mean you would prefer it.