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I just purchased a coffee roasting business and am having trouble with my beans chipping.  Especially in the darker roasts.  I am roasting on a Diedrich IR-3N that we moved out to our acreage and converted to propane.

I was trained by the previous owner and am roasting to his specific profiles.  The chipping problem developed after the move with the conversion to propane.

Any advise and help would be greatly appreciated.

Thanks

Brett