[2021-06-15]
After measuring the sensor noises (will post a log after modeling), I began to measure the cross-coupling of the sensors.
It turned out that the readouts are so coupled that I can't really begin to understand what's happening. Please see the figures attached.
We have changed the sensing matrix LVDT2EUL previously and for whatever reason, it seems to not work now.
I am inclined to reinstall the sensing matrix derived from first principles, i.e. from geometry., and see how it goes.