A
Gas Blender is the best method of providing the correct blend for the SW. I would follow this recommendation first:
The PSI at the keg is subject to the temperature of the liquid. At 40-41F the equilibrium PSI pressure required is about 28-29 PSI.
Forget about the changing of pressure for restiction. Otherwise you will loose equilibrium. I could never understand why you would change 100% CO2 pressure when it should always be based on temperaure to gain equilibrium. Start with about 12' of 3/16" ID vinyl and trim back in six inch increments until you obtain the desired flow rate.
Scott Zuhse, Instructor
Micro Matic Dispense Institute