I tried the Boos 1.5" and the 2.25" cutting board supported by #2 Vibrapods around the perimeter. The 1.5" for me was the best by a wide margin. I use 1.5" Boos that I cut to size under my DAC's, tube & solid state electronics, and transports with very good results. I currently am using a Gingko Cloud under the Classic. The other turntable in the system with the Classic is on a 1.5" Boos and Stillpoints. I have found that one must experiment with supports.
I use a Benz ACE SL S cartridge, a VPI cable, and an Allnic H1500 II SE phono stage with the Classic. I found that dampening fluid was necessary. Without it, I had lack of focus and a sound stage that was very wide with little height.
The periphery ring clamp a center weight is a good upgrade.