Update on my system.
Your 15psi seems to be on the money for my setup. I set it at 14psi to see what happens, and small bubbles started appearing in the bear lines again (CO2 breaking out). I adjusted it to 16psi, and they disappeared completely, but after a couple of days, it appeared as the beer was increasing its carbonation (lots more bubbles rising in the glass in comparison to when I first tapped it). So I have it locked down at 15psi. I am surprised that the window is so small? Perhaps my regulator gauge is off?
I increased the beer line to 8.5 feet. That helped a great deal. It slows the pour down to a nice controllable rate. Even if I do get a little squirt of foam due to the faucet being slightly warmer, since the beer is coming out slowly, I don't end up with an entire glass of foam. I get a nice drinkable beer. If anything, I would add another foot of line, as I am in no rush to fill my glass. It is still filling twice as fast as any handpump keg party I have been to!
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