I've just cured the same problem with my system using a system called DISC 1. Using this system you print off a course colour chart showing 30 pictures in variations of the grey scale. By picking out the picture that resembles the closest possible grey without any colour casts you can then adjust the colour balance of the programme you are using or on the printer, each picture gives you figures for the colours that require adjustment. For example the picture that resembled grey on my system suggested an increase of 5 yellow and 5 red. If you e-mail me I'll send you a demo.