Gas Ok But not do Cooling Solve Problem

Gas is OK But Cooling Problem

I checked a 2 Ton AC (non inverter) that Gas is Complete but Not do Cooling Best. After this i check this Ampere this  is Show low  Ampere 8.8 while a 2 Ton AC (non inverter) Takes nearby 11 Ampere. Then is this outdoor Unit have discharge Valve then i check discharge pressure his discharge pressure is show on Gage 120 psi while discharge pressure of R22 pressure should be between 250 to 300 psi.  This Unit discharge pressure is low his Compressor is weak and this cooling is not perfect. We should change this Compressor. You can watch video scroll down