Does it make a damn bit of difference? I'm working with a body-mounted pickup right now, and I'm debating between hard and soft (i.e. rubber) shims. Now obviously, the latter would make it a lot easier to dial in the right pickup height. The former appeals to my inner tone superstitions - something about vibration transfer from the body, harmonics, etc. - but since swapping shims means removing strings, it's a right pain to get the height dialed in. Anybody out there feel one way or the other on this?