2.How can you change the torque applied to a system? (There are 3 options)?

Answer 1

Torque= tangential force * distance [point of force contact to revolving body's center]
so to change torque :
1 change force
2 change distance
3 change material of body

Answer 2

Ratchet up the Force used to apply the pressure, to achieve the desired Pounds per Square Foot.

Then gauge the Calibration accuracy with a standard torque testing device to confirm.