When you tee off and the wind is light and / or from behind you, you will get a little more distance if you use full back spin. It will make the ball fly higher and farther in the air but with very little roll. This is very helpful on shots where there are bunkers or rough that you need to carry. When you use top spin it will make the ball hit the ground sooner, but you do get more roll. The R 11's have a high trajectory, so you could try the zrixon balls. I used them when I at your level and found that they work well with the R 11's as they don't fly as high as other balls. You will just have to experiment to find what works best for you.
spg777