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Took a look at the code generating the new current signal I'm reading and it's got some constants that look suspicious. It looks like I can remove 7 lines of code and replace them with a one liner that should exhibit the expected behavior. I'll try it out when I get into the shop.

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Sent my fix back to the original author, he suggested some further constant tweaks. I haven't checked with a live batch yet, but I can hold a sheet of paper in front of the camera to confirm that the signal no longer drops out when the coffee gets too bright, so I'll see how that goes. I still haven't done any proper calibration on the receiving end.

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