Just use the Linn felt mat. Bought my LP12 in 88'. Kept it a Linn till 95/96; then started to think that I could tweek it for the better. Still sounded great, but didn't realize that I had lost the Linn ability to "Play the Tune" In April, I took it to "Tom" at Ovature Audio in Ann Arbor, MI. Tom overhauled my Linn, - upgraded Tonearm cable, New Felt Mat, put the special mat I had on it along w/ the SOTA Cosmos record clamp in a box. The Linn now "Plays the Tune" again! As it says in the Linn manual. They are continually trying to improve the LP 12!! Stay with stock Linn or Linn upgrades ( even if they are expensive) You will have a great table that will play with other tables at their respective price points.
Best Wishes on your Journey