Yep... gotta go to the parallelogram rear wheels..

I have attempted to ride the 2-wheel handcycle on the back roads without the discomfort of vehicles or other riders in close proximity.  While I can easily "keep a line", I cannot keep the balance.  Usually, when a bike falls to one side or the other, one would steer in the direction of the fall in order to shift the balance back to center.  That does not work well since my center of gravity is so low.  I do not believe that practice will help.  So, I will start building the rear parallelogram.