Should we ask for a move?
Yes, I would second that request although, I would not get too caught up with labels. The whole "Data Science", "Network Science" and other terms, are sitting a bit oddly with my understanding. What else does anyone expect a scientist to do other than work with data? So, independently of whether "we" are scientists or DSP can be ...
Your SE.DSP question is still not clear to me:
Is there an ordinal variable (e.g. time) to help you with separating latent variables? Or is the problem purely instantaneous?
How can you quantify "obtain fairly accurate composition"?
What are your sensor characteristics (esp. regarding saturation)?
Your question, IMHO, is not yet precise enough, or ...