How many OD|Stops/step are in your wedge?

If it is a 21 step, 0.15 OD/step | 0.5 stop/step wedge then 9 steps is 4.5 stops which is about right for a grade #2 - #2.5 paper.

For Ilford MGIV RC, as an example: http://www.darkroomautomation.com/su...mgivrczone.jpg