I also set mine at 25 yds, but my bow is slow compared to many, only 235 fps. So, at 20 yds I hold ~ 6" low, dead on at 25 yds, ~6" high at 30 yds, but at 40 yds I don't shoot unless I reset the sight to 40 yds, otherwise I would have to hold ~15"-18" high and that is too much guesswork. At 40 yds I feel there should be enough time to reset the sight & hold dead on. If you have a fast bow, your vertical variation would be closer.
"A Nation of Sheep Breeds a Government of Wolves!"
2007/2008 Commander: 60lb/28" DL, HHA OL5519, Code Red, Choc Addiction, .400 Axis, Self-made Shoot-Thru
2010 Elite GT500: 60lb/HHA DS5500, QAD UltraRest HD Pro Series, Victory VForce HV 400
1965 Bear Kodiak Magnum Recurve 50lb, 52", Original Bear Quiver & Cedar Arrows