Gotta switch to dry ice or a chiller for good rates. Also look into a jacketed collection, a sous vide, a stainless magnetic driven pond pump, fittings and hoses. Or if you want you could just do the poor mans jacket like I posted before, which is drilling 1/2" holes into a homer bucket (and/or appropriate size bucket to fit your collection) and then adding washers, shut-offs and quick connects. … Vapor generation is important not just chilling capacity.