Didn't you say you've had this printer for 5 years though? If you've been static free for five years in the same room, it's unlikely that all of a sudden you're going to be plagued by static.
With all the problems with my flatbed, everyone kept point at static cause it's apparently a catch all type problem. Being in Colorado it made sense at the time. I bought expensive humidifiers (that don't do jack) installed HVAC in the room to heat it and tried virtually every possible static eliminator. Nothing worked...because it's not a static problem.
Nevertheless, instead of investing in expensive humidifiers, first just try to eliminate the possibility of static on your media first. Try dryer sheets, alcohol, combing the media with a grounded wire. It wouldn't take must to test. Personally I use some stuff from mpc specifically made to prep acrylic and eliminate static but I it's expensive and probably not needed for your application. You can also detect built up static with a standard multi-meter.