Couple things I find for me personally when shooting out side is the sun. Over the years of shooting outdoor 3D competition s is sun location .. if its super bright out I always tend to shoot a touch left. Another big thing is string stretching after a day of shooting in the heat .. a little bit of stretch will twist your peep causing you to compensate the slightest little bit without knowing you are compensating ... typically after shooting alot of arrows shoulders and back gets fatigued resulting in tourquing your bow..
Next time start shooting your sixty first and see how you do .. preferably on a cloudy day . see if you notice a difference ..
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