We have a pinpoint carbonator at the moment. That being said a couple things you might look at. Does your regulator have a high enough flow rate? We had to buy a large regulator to get the proper CFM for inline carbonating. I would not worry about seeing a few bubbles in the sight glass, as long as you have your bbt under pressure it will not scrub out. Also why not sanitize a hose and hook it up from CIP to CIP as a count pressure line? BOth tanks would be at the same pressure and the pump would do the work. We never have a bright tank full of foam.
CBO "Chief Brewing Officer" / Zymurgist
Bluegrass Brewing Co
636 East Main St