Shaft Type And Flex
Correct shaft type and flex will produce maximum distance, an ability to shape shots, ability to control trajectory, and preferred feel.

Consider the following solutions when picking out a shaft.

If Trajectory Is Too Low If Trajectory Is Too High
Softer Flex Stiffer Flex
More Torque Less Torque
Lower Flexpoint Higher Flexpoint
Lighter Weighted Shaft Heavier Weighted Shaft