Then your test data is still incorrect, what you need is to do is:
- Wait until the process output has settled in one operating point
- Apply one single step in the process input.
- Wait until the process output settles again into another operating point.
The data you shared is not useful, because you make many small changes in the input and do not let the output settle. What we need is one single input step and record how the output settles from one stable value into another one caused by the input change.