A 2" cylinder has an area of approximately 3.14 square inches , length of stroke doesn't matter.
So just multiply the air pressure used , by the bore size (3.14") , and you have total force exerted on cheese.
100 psi x 3.14 = 314 lbs of total downward force on the cheese (when using 100 psi).
A 7" mold has a surface area of approximately 38.5 square inches.
Total force (314 pounds) divided by 38.5 = approximately 8.155 pounds of force exerted on each square inch of cheese , or 8.155 PSI.
If you figure out the force exerted at 100 psi air pressure , then the rest is easy , using 50 psi air pressure , would give you half that , 25 psi would be one quarter of that and so on..........
Area calculator is (a = pi * r2) .