Hi Peter, you may know this, but I recently sold my SME 20/2a SME IV.Vi and went to a Grand Prix Audio Monaco table and Triplanar arm.
I feel this combo definitely betters the SME in the PRaT area. Piano notes hit with more authority and sustain for instanace. The timing seems more precise in a hard to explain way. Noise floor is also lower allowing more details etc to emerge.
Now the SME is still very good and it presents a cohesiveness to the sound that is alluring. Also a "wetness" to each note.
Now I've never heard a SME 30/2 or 30/12, maybe there better tables improve things.
I never tried any different clamps/mat's etc on my SME. I did try several power cords and isolation...which did help quite a bit.
One of these days, maybe if I win a lottery, I'd love to have a SME 30/12. And keep my direct drive as well...