Greeting Fellow Brewer,
Doing an unrelated search, I stumbled across your thread. Glad to hear you got your overcarb squared away. What stuck out to me was the data you posted in your initial inquiry. (I.E. 35F@12psi with 6' of 1/4" line.) Just so you know I'm not talking out of my ass, I'm a professional brewer certified in draft systems by Micro Matic and I operate a Brewpub with 3 bars totaling 48 faucets and 4000' of draft line. (
http://www.Rockfordbrewingco.com) In order to get your beer pouring flawlessly your system needs to be balanced. 1/4" vinyl tubing has a restriction of .85 pounds per foot (ppf). In order to balance the 12 pounds on your keg, (the correct pressure for 2.73 volumes of co2 @ 35F) you need to apply the following: 12pounds divided by the ppf of the tubing (.85) for the length of the line required (14') to provide the correct resistance and "balance" the system. You know it's right when you can pour a pint in exactly 8 seconds. 3/16" tubing has a resistance of 3 ppf. Therefore, you can achieve the same balance with 4 feet of line. Most guys like a little over-restriction and I'm one of them so i wouldn't be afraid to go all the way to 5 feet. I don't know how it's pouring for you, but I'd bet if you went to 3/16" line you'd see a big improvement.
Cheers,
Steve Lenox
Head Brewer, Rockford Brewing Company, Rockford, Illinois
P.S. If you dial back your pressure to 10psi, your co2 level will drop to 2.52 volumes after a week or so and pour even smoother.