I run my homebrew through 3/16" tubing about 6'. I have a Johnson A419 controlling a chest freezer at 38 degrees. If I run 8-10psi I am usually in pretty good shape. One thing that I can tell you is that if you over-carbonate the beer it will foam up as well.
I like to force carbonate my homebrew by cranking it up to 30psi in the keg and then disconnecting the feed, shake up the keg... wait a day or so and then repeat as needed. I don't use any priming.
------Alex Barger------
Member of:
www.lancasterbrewers.com
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www.shadyoakipa.com