What elevation do you live at? If you are at sea level and are dispensing a common 2.5 volume product (most domestics), for 34F you should target 12 PSIG and leave the five foot of 3/16" installed. Do not control the flow rate speed with your pressure. You alter this with the length of 3/16"
Scott Zuhse, Instructor
Micro Matic Dispense Institute