I've found that going from a Shure gauge to digital scales made a tremendous improvement in reliabile readings, I don't know if I necessarily agree with the magnet theory, but the scale WILL be much more precise. I do agree there is as much as a gram difference between the two.
I'd try it if I were you. Sometimes Occam's Razor works!
I'd try it if I were you. Sometimes Occam's Razor works!