First comment would be that you could have used the the parts in surgery!!! Great job cleaning! No telling what the temperature of the beer could be from the liquor store. Takes awhile for the beer to aclimate. Possibly overnight. Bud light has 2.5 volumes of CO2 in it and to keep this intact as you dispense at your elevation at 36F you will require 15 PSIG. At this pressure try about 7' of 3/16 and if this is too slow cut back in 4" increments until desired flow rate is obtained. Do not clamp at coupler until you reach your flow rate. As to the initial keg and the slight amount of foam at the faucet - two issues which will cause this. PSIG slightly low or a heat source at the shank and faucet. If you can not solve this, do not pour the clear beer on top of the foam. This will cause more foam. Do you have a double gauge regulator? If so, you can use this to leak test. Let us know.
Scott Zuhse, Instructor
Micro Matic Dispense Institute