Using the HHA Optimizer Lite for hunting. But I have hunted with one single pin for years. Love this sight. The light is awesome. The sight is very durable. This will be year three in the field with the sight. I follow the advice you noted. Set it at 25 yards and leave it there. I just make sure to practice slinging a handful of arrows at least 6 days a week. I just randomly move about the target, not measuring anything, as I practice. I move about from one spot to the next. From time to time, I also practice guessing distances by tossing an item (e.g. A ball) around and then measuring the distance with a measuring wheel. That seems to help with guessing.

Best of luck.