I made a big mistake when i cover my plane, i covered bottom wing with the same color of the top.... that caused me a lot of times disorientation. Now i put colors like white in the bottom and red in the top. This really helped me out with disorientiation problem. Of course, the sun stills a problem... not only for me, for you, but to all. Avoid him, never lose you concentration, and you will have not much problem.