RE: Some thoughts on the whisker buscuit
Don:
Paper tuning at various distances, as you appear to have done, is one way to check. Another is to modify a WB to a very extreme way to check for such things as incorrect spine. This would require several extra 'disks'.
As far as the MZEs' causing vibration, that's a new one on me. We and our customers have never experienced this phenomenon. Could it be that your installation methods are incorrect; or, are your bows/hands THAT sensitive?