I have WTL Amadeus Mk 2 that I purchased in 2014. I have used the RPM app to measure speed and W/F. For the W/F measurement, I get 0.28-.0.38%. This seems high. I make my own belts using the recommended jig. I use the Radio Shack wall wart as recommended on this forum.-the supplied wall wart produced a buzz. Would DPS help with this?