I have decent size on my biceps, I think about 16.5 - 17 inches. The problem is that my biceps are very long and wide, but they are not tall, kind of squared off. I need to form a better peak. Does anyone have an exercise to improve that? I've tried the narrow grip cable curls, I've tried the twist at the end of dumbbell curls. What's up, can someone help me out over here? It would be greatly appreciated.