If you can put a humidifier in the room, that should help.
I have a static problem with the mats on my Accuquilt and did not find that the dryer sheet method helped appreciably. Last time I dipped a washcloth in water, wrung it out, and put some liquid fabric softener (Downey) on the cloth. I rubbed it over the plastic and let it dry. That helped a lot and seemed to last.