It sounds like a VTA issue to me. Lower the pivot end of the arm, slightly. If it is already as low as it can go, then cut a piece of cardboard(non-corrugated) that is about the thickness of a matchbook cover, in the shape of your platter. Put it under your mat. If this improves things, then try using two layers of cardboard. Once you figure out how high to go, then you know what thickness of the new mat will be, that you need to buy. I know cardboard may not be the ideal material to do this with, but we're not looking for a permanent solution with this, just trying to determine how much spacing you need for your VTA adjustment. You can then get the right thickness mat, that will be made of the right material. If you would rather use another material than cardboard, that's fine, just so long as you get the spacing result that you want.
The other option would be to buy pre-made spacers to put between your cartridge and the headshell. This is alot more difficult, but will achieve the same end.
Also, the 10x4 is designed to work into your MM input on your phono section. It is possible that the loading on the MC section may be set at something other than 47k, which is what the 10x4 is designed to work into.
The other option would be to buy pre-made spacers to put between your cartridge and the headshell. This is alot more difficult, but will achieve the same end.
Also, the 10x4 is designed to work into your MM input on your phono section. It is possible that the loading on the MC section may be set at something other than 47k, which is what the 10x4 is designed to work into.