The Linn felt mat damps out the platter and is spec’ed for the table. While I suspect you have not really AB’ed a number of mats for the Linn, the unfortunate thing ( unfortunate, as the felt mat does incur static) is that of all the mats I have heard on the table ( and that includes rubber and vinyl) the felt is easily heard as being superior.@daveyf This really strongly suggests that you are dealing with a resonance- and that the felt is part of the tailored sound as a result. I prefer to kill resonance and vibration entirely. I've had the good fortune to have a platter pad that does that really well (it was designed over a ten year period using many different turntables) and also master tapes- and the machines on which the tapes were made, as well as LPs made from the tapes.
At any rate, felt isn't going to work if you want to get rid of static. A spinning LP made of plastic acts very much in the same way as a Van de Graaff generator but if the LP has a low dielectric constant with respect to the metal platter, static charges can drain off without popping or the like.