If you need a readily available CG locator application that figures static margin, try http://www.geistware.com/rcmodeling/cg_super_calc.htm

It's as available as the internet and works really well. And to find out the location for any static margin you wish, simply type it in.

Let me address your question from a different perspective, however.
What makes an airplane unresponsive that pertains to the static margin, isn't what makes an airplane more or less stable. It's sorta related, but only a little.

When you move the CG way forward, the horizontal tail has more work to do simply from having to balance the weight shift. And it uses up some elevator deflection carrying that load. What it uses up simply carrying the "imbalance" is no longer available for pilot requests to pitch the airplane. So the CG shift is actually reducing the effectiveness of the elevator. How do you solve the problem when you elevator is not effective enough? Give the elevator more throw. Up to a point that works.