I am still in the process of sorting out a Technics SP-25 turntable, especially with regard to static. One thing I have learned is that a carbon-fiber brush is bad news, static-wise. I always used to wonder why others thought so, because I never had severe problems with the carbon-fiber brush on other turntables. But with the Technics, brushing one side on a static-free record will charge it up a fair amount, and then brushing the other after playing the first, will result in so much charge that the heavy rubber mat wants to come up when lifting the record off. This even happens when using the KAB metal mat, as it is laminated with clear plastic on both sides. If someone made a 2 or 3 mm thick copper mat, no plastic, with a dished center and a 11.5 inch diameter, I'd buy it.
The dryer-sheet trick did nothing for me, under the rubber mat, at least. Static can be frustrating.