I also have a GAE bought when they were introduced and like you have replaced the OEM mat. In my case: leather, acrylic, Herbies, Origin Live (favored for years) and recently the new Origin Live Strata. The Strata is magic. Really. Expensive (295 pounds sterling), but worth it and it has a return privilege if you are not satisfied. One word of caution, Origin sells the Stata in a slightly smaller diameter version specifically for all SL1200 turntables. Since I also bought a Strata for my HW40 in the standard size, I tried both sizes and much prefer the standard size mat. The smaller mat just looks funny to me on the GAE. Same price, same sound, just an aesthetic thing.
Turntable Mats for Technics Grand Class, "G" Series
I have the original anniversary edition Technics 1200 GAE. Shortly after I got it way back in like 2016, I put the rubber turntable mat aside and began using a leather and cork matt from Wooden Bull. See https://woodenbull.com. I never looked back.
Recently, I pulled out a Ringmat and noticed a more robust sound with more definition in the low end.
I'd like to try another. Recommendations?