Greetings.
My Kyosho Super Stearman is currently in its fifth year of flying, and I yet have to tire of it.
I looked in my records and found the balance point at which to place the fulcrum, is four inches aft from the leading edge under the top wing (101.6 mm). Balancing required five ounces of lead to be added to the front of my engine mount beams. Power is a TT .46 with a Bisson Pitts style muffler, SonicTronics 310 glow plug, swinging a MA 11 x 6 prop while using Morgan Omega 5% fuel. Throws are set to: Aileron--5/8" down, 11/16" up, Elevator--5/8" up, 7/8" down, Rudder--1 1/4 " both left and right. The aileron hinge line is sealed with Monokote. Only one important change was made to this model: A wedge-shaped piece of spruce was added to the landing gear strut mounting face at the fuselage to angle the gear forward so that the centerline of the wheels are even with the leading edge of the top wing when the model is horizontal (level flight attitude). This prevents the model from nosing-over. New screw holes were needed, of course, and the old holes plugged.

Good luck with your endeavors.
Regards,
DrGO