I'll try to explain this the best i can, so we now have a Ricoh c9100 which is new to me, i've always run a Versant 3100. Both machines pretty much print identical colours for the majority of jobs but the Ricoh struggles with light tints and i've noticed there's a big difference in the calibration sheets. See the attached image, i've sliced the 2 strips where its most noticeable (black to yellow and magenta to cyan) and put them together to compare. You can see the gradient is a lot wider on the Versant strips and i think this is where the issue is? If you have a Ricoh whats your gradients like on the calibration page?