I have heard that adding setback will change the way the boat handles. I have a 6" Hydro Dynamics Rapid Jack Magnum that I will be selling in a few weeks. I am getting a new 10" from Steve. If you are interested, PM me. Steve can install it for a charge ($150ish?). It isn't powder coated, so the grey color will go nicely with your boat.
<insert new truck and boat here>