You can view your gauge speed percentage when looking on the Club screen from the main menu. If your gauge speed is too high, try enhancing some components that will increase your Accuracy stat. The higher your accuracy stat is compared to your power stat, the less the gauge will shake.
The surface will also effect the shot gauge, the less smooth the surface the more the gauge will shake, increasing your recovery stat will slow the gauge down.
Older devices may find that changing Settings (accessed by selecting your name or picture in the Main Menu screen) for "Graphic Quality" to Min and unchecking "Enable Anti-aliasing" can improve performance.