
Even though there is a wobble going on with the RoR trace, the overall profile still doesn't look to bad, apart from the droop after 1st-Crack. If it's down to anything, given the short cycle nature of the reported temperature excursions, I'd reckon it's more likely to be something going on with HG temperature control than anything else. How old is the HG by the way? May be able to claim a replacement under warranty...
If you have a Bead t/couple, you could try positioning it in the HG exhaust stream while varying the output of the Gun, and watching the trace in the Roast Monitor software and the DMM indicated temperature at the same time...
Might be able to determine where the origin lies that way...

Mal.

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