I recommend you make a print ring-around. If you don't know what that is then: make one print you think is as close as possible, then make six prints that are 5cc in each of the six colors around it. You can extend that to a second set of 10cc in each direction, or lessen it with only 2.5cc. The point is to create prints with an equal amount of change in each color to compare. This can help clarify which color is causing the color cast and by how much.