I recently purchased a "Center of Gravity" brew stand from N.Brewer. Nice stand. My first brew on it was fine, but the flame was more yellow than blue, and it was pretty obvious from the smell of incomplete combustion that they weren't burning properly, plus the kettles were black with soot on the bottom. I adjusted the dampers and the regulator, but to no avail. Looking these burners up on line, they appear to want a 10 to 40 psi regulator, but the unit was sent with a 5 psi regulator, a three way splitter, with a not very precise needle valve on each burner. Could the regulator be the problem? Funky needle valves? I'd love to resolve this, but my knowledge of propane is limited, so if anyone has any ideas I'd love to hear them. Thanks.