When I got my kegerator I had foam problems. I have replaced line with 12' 3/16" and the regulator to a taprite. Now I don't get any head on the pour, even if it is straight down into the glass. I am at 37° and 12 psi. Do I just need to crank up the pressure? Where I am now is in the yellow on the carb chart. I am hesitant to turn it up more because I don't want to go back to where I was previously.