100LL

Ok I have been looking into this question for quite some time and still can't figgure out an answer. What I'm looking at is to find a way to compute how much weight must be added at lets say station A, to move the CG so many inches forward or aft. All the weight shift forumuals I have found don't work with my scenario so is there another way to figgure this out?

So in other words, for example the airplane has exceeded the forward CG envelope, so I'm trying to figgure out how much ballast must be added to the baggage compartment to bring my CG so many inches aft. Would be nice to know there is a simple computation I could do without the hassle of making numerous W&B calcuations over and over again.