Static electricity pulled the rubber mat right off the Turntable!

Hey Brent don't know what's up with your GR. I'm using a Funk Firm Achromat 3mm on top of the rubber mat without a static prob.  It's 93 and humid here today and my AC is set to 68. Now that I think about it I was pretty staticky until using the Funk mat. 

Do you have a ground wire from the TT chassis to ground?  Maybe even the ground on the wall power socket?  Might want to try a continuity check between the tt chassis / plinth and ground.

If you have a static issue, Gruv Glide will totally cure it.  Period.  I'm not saying it sounds better, it will NEVER hurt your records or any other things that make people start lining up like Gangs of NY.  IMO, based on years of use, at least in the past, it totally takes care of static and leaves a very little bit of gunk on the record, which the stylus removes after a play or 2 at most.  It has never harmed one of my records and made them much more enjoyable to play without electrocuting myself.  Now that I have a Basis with a grounded bearing, static doesn't seem to be an issue, so I don't use it, but I would definitely recommend it for you.  It will make your analog life better I think.