Before messing with pressure always check for pressure leaks. If there is a pressure drop in the system, the diaphragm in the regulator will always be moving whereas it will be very difficult for the regulator to perform. The pointer on the low pressure gauge will not stay in one area.
Perform a search on "Leak Test" on the forum. Tons of posts.
Have you contacted Left Hand and asked them what there carbonation level in volumes is in the Sawtooth?
If it is around 2.5 and with 38 degree beer temperature at your elevation, 15 PSIG should be where you want to be. The five feet of 3/16" will result in around a 120 oz. / min. flow speed.
Sea level is regarded as 1- 1000' feet. Start you elevation adjustments above 1000'.
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