I have a tower with 2 perlick 525ss faucets. They both have 6 feet of 3/16 line and are fed off the same regulator. One works perfect and the other foams the first beer then poors fine. 15 minutes later it foams it again. Seem worst when you first pull it. Any idea what could be causing this? I clean the lines with BLC and sanitize with starsan. This seems to be getting worse.