I road with Haymaker up in Maine last year. My bike had about 500 miles on it, his had lots of miles. Jetting, exhaust, everything very similar. My bike was gurgling like a fountain. His never had a problem. We were both abusing the clutch heavily and riding same pace. Could be a newer motor. Could just be difference between individual motors. Just throw in evans and see if the problem goes away. Sounds to me like you are chasing shadows.