I have an LG dryer model DLG2141W originally set up for Nat gas then converted to propane. yesterday I made the conversion back to Nat gas. I replaced orifice and turned the adjustment screw all the way out as far as it would go. Now my question is, what should the flame look like. It is blue but it is very large. the flame lights and goes into what looks like a 5 or 6" duct.(excuse me for not knowing the technical term for the part) The flame fills this entire diameter. Should the flame be this large???