I did another run last nite... same boundary conditions... but with the horizontal stab located at the top of the fuse....
It almost looks like the low pressure on the leading edge og the vertical is superimposing on the top surface of the left stab...
perhaps this low pressure is the dominant Nose-Down pitch force???

the magnitude of the force is about 5 or 6 ounces.... and all of the force comes from the left stab... the pressures on the right
stab are a net zero...