One of the reasons I don't see a lot of reason to experiment with sideforce generators is that they only really help in two maneuvers, the Reverse Wingover and the Square Eights. Since the judges can't even see the square eights it's unlikely that they will even notice big improvements, so why bother.
The other issue is line tension and how it contributes to better flights. Take a really close look at how your plane flies at various lap times. I guarantee you it will fly smoother and wobble less when it is flying faster. Every plane I have ever flown flies better faster. You may not like the control feel or the excessive line pull, but the plane flies better when it pulls harder and the lines are straighter.
Yes, you can trim the plane to fly square to the edge of the circle with the leadout rake. But a light plane flying with 5 deg. of rake will have a lot more problems with the lines whipping around and upsetting the plane than a heavier plane flying with 2.5 deg. of rake. It's also another reason for the quest for steady flight speeds. The line rake varies with airspeed, and one setting is really only good over a very narrow range. When the airspeed changes, the line rake changes and the plane starts to yaw. This really becomes obvious when you take a lightly loaded ship and fly it through some hard square eights. After a few corners you can see the lines whipping around several feet, yawing the plane in and out as much as 20 deg. or more.
It would be an advantage if you could trim the plane to fly at 45 mph or even a bit less. At that speed most pilots would be getting into the range where their reflexes are faster than the five foot pullout alititude. You can see and react down in the 3 ft range which lets you actually fly the plane down to the right height instead of trying to guess at 15 ft where it is going to end up. But at 45 mph your good ol' Nobler is flying 5.8 sec laps and feels like it is going to fall out of the sky. Side force generators to get the line pull back up to eight pounds or so(2 lb. of side force) would be great.
How about putting 10 little vertical winglets along the spar on each panel. 10 top and bottom, say 1 in. x 3 in. tall. That would be 120 square inches of winglets. I'd make them with a Clark Y flat bottom section to make them easy to line up with the centerline and still generate lots of lift.
Better yet, how about a Mighty Slobbery? Biplane with 6 in. x 40 in. wings. Space them 7 in. apart and add 4 vertical "struts" between the wings on each side, eight in all. The struts would have a flat bottom section, positioned to lift outboard. Each strut an 1.25 in. wide. for a total of 70 square inches.