I also always just went with trial and error. It may be helpful to mark the wing posts each time you do with a different color, so you know how much adjustment worked and how much didn't - and also if the wingposts move at all during flight. Personally, I found it easier to correct stalling with just adding ballast at the front/back of the motor stick, or moving the entire wing forward or backward on the motor stick.
2020 Events: Fossils, Gravity Vehicle, Wright Stuff, Ping Pong Parachute
2019 Events: Fossils, Mousetrap Vehicle, Wright Stuff
2018 Events: Helicopters, Mousetrap Vehicle, Parasitology, WIDI
2017 Events: Ecology, Invasives, Wright Stuff
2016 Events: Crave the Wave, Dynamic Planet, Invasives