Could it be caused by processing lag?
I did leave the cycle and sample to auto, not sure how many sample points are needed for the logging function to work.

Can’t say for sure right now. I ran a test since my last post and have reproduced the issue on a meter with more debugging instrumentation attached.

Is there a way to have it dump the untouched/processed 24bit data it gets from the other chip when logging?

Unfortunately no. I can get those numbers with some effort through my debug setup, but it’s not accessible through the app.

Also noticed that the batteries are now down to 50%.
Is it possible to buy just the shell (I’d like to make a non-AA powered adapter of sorts)

Email me at james@moosh.im with shipping information. You’ve been extremely helpful here so I don’t mind sending you some extra shells free of charge.