Del Vento Jay, I saw you haven't worked on the repo for about a month, let me know if there is anything I can do to help (e.g. taking a look at the firmware) and/or if I can start ordering some of your parts and mess around with them (or if you think you'll be making many more chances)
I made a round of revisions to all/most of the PCBs, and I've just been tweaking them and staring at them, waiting to see if I'm inspired to make any further changes. I'll finalize the next revisions real soon now and order a batch. (I asked an artist to come up with some whimsical silkscreen art for the boards, because that sort of thing amuses me. Whenever that comes back, "soon" will have arrived.)
I'm hoping that the changes I made to the ADC board will further improve the signal quality. I didn't want to expend any more effort worrying/mucking about trying to fix hardware problems in software, when I could (attempt to) fix the hardware.
I don't expect to change the interfaces between the sensor boards, ADC boards, and main board, for what that's worth. (Or between the sensor boards and LED power board.)