powder testing is using athletes foot powder spray on your rest and cables and shooting to see if your fletch will wipe it off. This shows fletch contact. However, you can't do it on a WB except on the outside ring of the Biscuit.

Your groups are now doing what exactly? Have you lined the WB up like I described or at least looked at it to see if it lines up like I described?
Have we shot through paper yet?