I have had much experience with both the Final Audio copper mat 4.5kg and the Micro Seiki 180 copper mat on a variety of TT's. Both of them sound significantly better when used with either a heavy stabiliser/washer or reflex clamp/washer.
I have both the Final Audio stabiliser (1.8kg) and Goldmund Reflex Clamp - different sounding but both are good. The Sota and Simply Physics Reflex clamps would be worth a look. You get the benefits of the copper and clamping properly takes the "edge off".
I also think the use of the copper mat on the SP10 provides a bimetallic dampening effect on the platter overall. I prefer it in this application to an acrylic mat.
I have both the Final Audio stabiliser (1.8kg) and Goldmund Reflex Clamp - different sounding but both are good. The Sota and Simply Physics Reflex clamps would be worth a look. You get the benefits of the copper and clamping properly takes the "edge off".
I also think the use of the copper mat on the SP10 provides a bimetallic dampening effect on the platter overall. I prefer it in this application to an acrylic mat.