Colour cast - reading patches

Hello all,
I am printing onto Epson Exhibition Fibre using the Pro inks in my 9800. There seems to be a warm cast in the mids and highlights to my eye. So I printed a ‘ink separation’ file and certainly to my in-experienced naked eye their seems to be a warm tone in the ‘5 to 25%’ range of the K channel (which is loaded with PK)
My sense is that somehow there is maybe some kind of ink ‘contamination’ Maybe one of the warm tones is still residual in that line? My question is, how do I determine that that is the case? Is there a way to read the patches with my i1Pro and see if they are ‘neutral’?
I have looked through the forums and havent found the answer so was hoping someone here could help?
Many thanks
Neil