We recommend adding a new attribute: ‘Sample name’ or ‘Sample number’. This should solve the problem.
We would also recommend scanning in various experiment set-ups, for example ground form of crisps or smashed form of potato chips.
Also, scanning in direct contact or close (0-5mm) to the sample.
Following that, you should evaluate the model performance for each set-up.
Feel free to contact us with any further question.
With your permission we can copy your data collection and give you some feedback.
The ConsumerPhysics Team