Had to take a brief break to unmelt my brain (not because I was trying to do something difficult but because I was about to do the easy thing in a way that was more difficult than it needed to be) but got done more than I planned on. That might be it for today's productivity, but I'll give some thought to what should come next.
Testing the past couple day's code by running a sweep through the relevant range of values and graphing the output in a spreadsheet pointed me at the existence of a bug which, once fixed, validated my hunch from several years back that the extra math involved in the new code did not produce a significant difference from computationally cheaper approach I went with originally. I still want to try a blend of the two methods with live data to see if the slight difference feels better.
The idea may also be applicable to CRUCS, so I might add it there some day, though that's a low priority for me.
Author of Typica software for coffee roasters.