I dlloyd and cattledog I welcome any other comments you might have but I think I have worked out the issue. See the attached pic. I changed the Increment column from 'the difference between one value to the next' to 'the difference between the value of one channels type (ie: A low) to the next value of the same type'.
In the pic you can see the result of this produced data that is much more sensible leaving what I can imagine is just harmonic/vibration.
Thanks again for all your time! You questions, suggestions and code we super helpful. 
