Open the faucet an quickly shut it. Shine a flashlight through the beer line just above the coupler. If you see tiny bubbles (no, not in the wine)slowly rising in the line, your pressure is too low and raise it one pound. Keep doing this until ther are no bubbles - opening the faucet each time. These bubbles are the actual CO2 in the beer breaking out because you do not have euilibrium.
How long is your 3/16" line. Also, between 34-36F is not an exact temperaure. calibrate your thermometer in ice water.
As to the initial shot of foam, dump it and start over. You cannot pour clear beer on top of foam.
Scott Zuhse, Instructor
Micro Matic Dispense Institute