I'm just a beginner, but I can't imagine that using 8 instead of 10, especially if 10 won't work on your reed. Have fun with the gamp. I really didn't think I could do it and by gosh, I did it. It's still my favorite thing of the fabrics I woven so far. In fact, when I finish my errands, I'm going to weave DLDDL on the muted color gamp later in the color and weave unit.
I have a Wolf question for you or anyone else who has a Wolf (Baby, Pup, or Mighty) loom. Do you ever have an issue with the brake cables getting crossed on the hub and if so, what did you do to fix it? I keep hoping there is a fix that doesn't involve dismantling it. For now, I very lightly tighten the brake before I loosen it to advance the warp. That helps most of the time. I have a Baby Wolf.
Enjoy the C&W gamp. It's a lot of fun to weave and very helpful for future weaving.