I'm a little confused by what happens to the design CG (balance point) when I move the fuel tank from its front location back to over the CG. You adjust location of weights with an empty tank to get to the designated balance point. Now, with a forward tank, this location presumably takes into account the effect on the flight CG of some percentage of the fuel in the tank. In other words, the designated location would be aft of the desired flight CG. It seems to me that with the tank "on the CG", you would end up being tail heavy if you balanced at the design point. Or am I missing something?