My take is this; the bars are attached to the housing and the housing separates from the body, wheelie bars move to far and unload the tire. So the cure appears to be different mounting of the bars or less housing rotation. With Cal-Tracs the front segment is basically solid but the instant center is very short and high. This increases separation. I see two avenues. Lower and lengthen the instant center or mount the wheelie bar to the body instead of the axle.
Doug