I have never had a Hog Bipe but after having 7 Aeromasters, 3 1/4 scale Moths, about 5 other large 1/4 scale bipes and many smaller ones, I have found that all flew best with the upper wing at about 1.5 degrees LESS angle of attack than the lower wing was set at. All also required about 3 to 5 degrees down thrust and about 3 degrees right thrust to track well. I did a lot of experimenting with the relative angles between the upper and lower wings and always wound up with the upper wing at a lower angle of attack than the lower wing was set at. When you build your model, I'd suggest you plan it so that you can do a bit of experimenting with this relationship and you will find that just minor changes can make a huge difference in how well the plane tracks and maneuvers. It can become quite a chore to change the relative angles for experimentation unless you plan ahead in the construction as the interplane struts and cabanes can become difficult to change.