I do not know if this will be of much help, but I just did some whisker tuning on my high country bow. I was using and older biscuit that has both vertical adjustments and horizontal.
I was doing this to demonstrate how the TURBO NOCK tunes. (which is somewhat different than conventional arrows)
I started by using no set up tools and attempted to tune to a bullet hole by reading just the paper tears.
I did eyeball both horizontal and vertical center and then started shooting at 5 ft.
The first shot had a low left tear. I lowered the rest one click on the biscuit and shot again. The left tear came up closer to horizontal.
I lowered it one more click and the next shot was dead horizontal but still a little left. Here Is where the TURBO differs. At this point you would move the rest toward the tear with a conventional arrow, I moved the rest away from the tear one click and shot a bullet hole. (you can not see the left right adjustments on the photos)
Bottom line It ususally takes only very small adjustments to get the whisker to shoot bulletholes. I am attaching a photo of the tuning I did,
I sketched in the tears because they did not show up well.