Test with high-speed timer instead, using a measurement of FPS. Run the weight high enough that the FPS starts to get shaky on its best test but not at a stand-still, otherwise you'd be measuring stand-still vs stand-still and that's not going to help you any.
Ghan has said he has fixed this. Monovertex please confirm this fix. This was only a problem with people that had signatures in the upper levels like not the special members but the respected members.