mine had the exact same problem, the driver's side tip was pointed slightly upwards, causing to catch and vibrate against the funnel in the diffuser.
sorted it tonight, ended up adjusting the back box across as per Ryan's advice from Scorpion then bent the tip downwards into place :)
Yeah about once a month, but more in the summer, the next big one is hartside in april so get yourself on the list for that one :) Yeah thats the one i meant, its been on ebay a while now
Welcome to the forum mate, have you bought the 200 from someone in newcastle? noticed there was one for sale on ebay lately. Hope to see you at a meet soon :)