About a month ago, I decided to try a QAD Ultra Rest (Hunter) on my Hoyt ProTec. It had a Whisker Biscuit on it and the bow was perfectly tuned - so I measured the distance from the center of the arrow to the bottom of the shelf, and also to the side of the shelf - so I could put the drop away rest in exactly the same position. After installation, the bow was still perfectly tuned and the sights were off only 1/2" at 25 yards.

Today, I got another QAD Ultra Rest Hunter and installed it on my Reflex bow. It also had a Whisker Biscuit on it and was perfectly tuned. After taking the same measurements, I installed the Ultra Rest and adjusted it to the same position as well. After installation, the bow was hitting about 7" low at 20 yards. I checked the tune, and it was still right on. So I wound up adjusting the sights. But I'm really puzzled at to why the Hoyt, with the rest in the same position as the WB, shot the same - and the Reflex would print so much differently. Any thoughts?