Fry, have you changed your line diameter yet? When you do, use the 5' recommendation and target 38 F @ 16PSI for Coors Lt. If you choose to change to a stout, you will have to change the gas source to a blend of 25% CO2 / 75% nitrogen. Set pressure at about 28 to 30 PSIG and use the same line configuration.
Scott Zuhse, Instructor
Micro Matic Dispense Institute