Are you clear about the meaning of force, Re-force and click ratio? Please see below for details.
Snap dome force is that the the force when you press down the snap dome to contact the pcb. It should be stability of the force in order to ensure quality of the snap dome.
Re-force is the pressure let the snap dome return back to top.
Click ratio=(Force-Re-force)/Force*100%, the click ratio is narmal between 35%-75%
If you want to know more details about snap dome, please contact us for more information.