I've shot nice tight groups, and then for some reason they scatter like roaches when the light goes on, at 5, 10, 15, 16, 18 and 20 paces.
Its when I don't think about it, that I shoot the best. It is mental, like BobCo 1965 said. Just remember, nothing becomes instinctive unless done 25,000 times.
I to was like you, I started out 41 yrs ago with a traditional bow, then I got the gadgit disease and thought I needed training wheels. Well I could not be happier shooter instictive again. I gave my modern compound to my son on 05/21 as I had been only using my Bear Kodiak, and love it.
Getting out of garage, can effect your focus and mental thought process. Start at 5 paces and work out from there. Stay outdoors, and not indoors with your shooting.
Keep up the good work.