They're needed, but won't have any effect on the foaming. You'll want to lengthen your beer line to tame the flow speed.
Your pressure should be appropriate for the beer and temp. A lager at 38* would require around 12 PSI. Different pressures for different size barrels is idiotic, and both those #'s are low.
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Always do sober what you said you'd do drunk. That will teach you to keep your mouth shut.
Ernest Hemingway
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