I also have a Sanyo 4912. I think your problem might be that your tower is too warm. You need to force cooler air from the bottom of the kegerator in to the tower, and/or run your beer line through a piece of copper pipe. That is what I did, and now I am getting perfect pours every time. Another issue might be the psi of the CO2 and the temp in your kegerator. I have a Samuel Adams Boston Lager in mine right now. I have the psi set at 13 and the temp at 38 degrees F. Hope this helps.
