RE: sig hog bipe CG problems
I think funkworks is correct, you have an incidence problem if you CG is where the plans say it should be. If that upper wing gets to positive with respect to the lower wing, the plane will be very squirley, double check to be sure that it is per plan. If not, start decreasing the upper wing incidence and you will find a point where it tames down and flys well. Also check your thrust line, make sure you have the proper right and down thrust.