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Jeff, the Webasto burner is not sensitive to more air than necessary.  I set the air shudder with the Philips screw point straight into the side (half open) to the screw all the way toward the heater tank (full open).  They are very sensitive to not enough air.

No help with Becket burner controller, above my pay grade.

Excellent, thanks for your input! I did actually open it up all the way for a while to help burn off some of the residuals inside. I will open it all the way up then.

Yea, no problem on the beckett conversion for me, I am an industrial electrician and I have a good wiring diagram from one of the wanderlodge folks, so it should be no problem.