Sorry if this has been addressed a thousand times before so I apologize in advance. I have a 2013 Z3 with the 409. I have 1200lb ballast bags on each side in the rear and 2 - 500lb bags up front. I also have Taps2 with the Convex VX. Where oh where is the optimal place to put lead? I currently have 300lbs. I'm guessing I need to get more. We pretty much surf exclusively. Any help Tige community?