Moving the Centre of Pressure (Lift) aft relative to the Centre of Gravity actually increases stability, to a point, beyond which excessive nose heaviness becomes a problem, needing either large amounts of up elevator trim, causing drag, or weight in the tail, or both, to correct.
Of course, in reality, the aerodynamics on these planes is impossible, never mind the C of G issues, the wing area has been reduced by half, or more, however here in One Wing Biplane World, the laws of physics are, shall we say, rather more accommodating ?
cheers,
Robin.