It seems that your beer lines are to short. I usually have 10-12psi per line and I run 8ft of beer line. A few I ran at 10ft. I don't have any foam issues and have the same keezer. I'd try that first
New member here. First, thanks for posting this build. I've gone through several threads of builds and keep coming back to yours for the main inspiration. I've decided to use the same freezer and temp controller but was curious as to which probe you went with since you are keeping it in a glass...