The number 8 is maxed on the modules, The cam has multiple posts to attach the string, one on each side, you need to put it on the A and the 1 and you will be at max draw. It will increase it half to 3/4 inch if I remember correctly, also add about 5lbs of draw weight.
With some tweaks to the cable and string you can get another half inch I bet as well, untwist the string slightly and twist the cable and yoke will get you that.
What do you think your draw length is, many get set up way too long, not sure where you are located but a decent pro shop can easily handle it, if they tell you they can't or it's not right, they are just not up to speed on the older bows.
I have made those tweaks hundreds of time to fit bows to guys!