Just need to shoot that single pin more! I leave mine at 30 most of the time. I practice shooting 20, 40 and even 50 with it set at 30 just in case. I know that at 20 I really do not need to do anything. Practice has shown my two main hunting bows shoot between 2.5 and 3"" high at 20 if my sight is set for 30
(4" low if I shoot 30 with my 20 - not exactly sure how that works)
. I can either hold center heart or adjust the sight if I want to shoot a grouse in the head. At 40 yards I shoot almost exactly 6" low using my 30 pin. I can hold center spine or adjust the sight. At 50 yards I shoot 16" low when set at 30. Which lucky for me is darn near exactly centered between my bubble and the fiber dot on the pin...pretty easy gap shoot there! But usually at 50 there is plenty of time to adjust the slider.
With a little practice you really do not need anything more than a single pin out to 50 yards if shooting at big game. But you need to document what you see when you shoot it set at 30. Repeat often and bring to solid memory. When I used to shoot a lot I would shoot six arrow groups using a Vegas three spot. One arrow at each spot with the sight set at 30. Then adjust the pin and shoot another three arrows. Doesn't take long before you can not do this or you are breaking arrows! Human brain is an amazing thing!