Cyan filters are not used in these charts, all they would do is create neutral density. I also have an Ilford chart, they are not alway quite accurate. Like developing film this is a starting guide. Experiment and take notes until you are getting the results you desire and use this as your new calibration. Remember add magenta for higher contrast and add yellow for lower. Some folks advocate having both colors in at the same time for neutral density so going from one grade to another will not change exposure times. If I remember rightly that was the focus of Butzis article.

You might want to doublecheck and be sure the filters are actuating when you turn the knobs, there's always the possibility of damage to used equipment.