The plastic preferred for designs that will be static sensitive are supposed to be carbon doped to conduct and bleed off static charges. If your scale pan is not responding to dryer sheets, dump it and get a replacement that conducts.
BTW, the substitution of MoS2 for Graphite doesn’t always work the same based on context. While both can be dry lubricants, they are at opposite extremes when it comes to dry versus humid conditions. In a dry environment, graphite will become abrasive while MoS2 will work at its best, and vice versa. Also, MoS2 will oxidize and become acidic in a humid environment so be careful where you use each. If you know there will be bone dry conditions, use MoS2. If you know there will be humid air, use graphite. If you are trying to keep a conductive layer, use graphite not MoS2.