First off, as reloaders, we most likely don't have our equipment in a controlled environment, so static happens. I've read all kinds of claims, one was some type of ferrule that magically made a chargemaster accurate every time to .02gr. Not possible, get some dryers sheets, used are fine, wipe it down once week, or static guard on a soft cloth. And then calibrate often, pay attn. to drift, know your pan weight, when removed needs to read - whatever it weighs.
There are some things that help I'm sure, but diligence with a bounce sheet will really do wonders.