Originally Posted by Yooper
I'd say the problem is the short beer line for the amount of carbonation you have. AT 15 psi, at at 45 degrees, you should be at 2.5 volumes of Co2- about perfect. I'd change right away to 10' of 3/16" beverage line and I think your problem will be solved.
I made a Christmas Ale recently and experienced same thing -- flat, but foamy.
Have 10 feet of tubing now and have temp at 42 degrees at 12psi.
Perfect pour and nice carbonation.
Thanks Yooper for the suggestion!