So my kegerator pours great the first pull, then it's foam city on beers after that. Keg connection lines 5 foot I believe, 36 degree temp inside, 120mm fan in the lid to move air, two epoxy mixers in each dip tube, pressure set to 11-12 psi. Pours a pint in about 9-11 seconds. First beer has a 1/2" head. Any pour after has a half glass of foam it seems. Any suggestions?