Need to measure LP SYSTEM using a manometer
On fridge gas valve is a test port...connect manometer there
Fire up stove top burners on High, fire off water heater and then fridge
Measure pressure after gas valve
Needs to be 11"WC with 50% of appliances in service
Main Reg has adjustment screw....under label typically on main body
Clockwise...increase
Have you disassembled burner and made sure it and orifice are clean
Doesn't take much to block an orifice or mess up the air/fuel mixture
**No poking anything thru orifice or blowing high pressure air thru it....can damage the laser cut metered hole
Soak in alcohol then just blow on it like a whistle