I'm running an a new MP40 on 1/2" thick glass. It's quite noisy and I have read a few threads about removing the gasket that sits between the dry side and the wet side. Right now I have the medium thickness spacer for 1/4" up to 1/2" thickness. Should I try going to the thinner rubber spacer that is for use on glass over 1/2" thick? Or should I go to no spacer at all?