Guest
I had a friend who shot the same way and his solution was to build a rest that looked like a big "T" and it was made out of light angle iron. he would pound it into the ground so it was at the right height for him to shoot using it as a rest in a standing offhand position.it wasn't rock solid but it gave him stability in the position he was trying to improve. he would shoot off this at one target for a couple shots and then shoot at another target offhand and so on his groups started tightening up right away. much of what we do when we are shooting is muscle memory and if you train your muscles to shoot larger groups they will continue to do it untill you retrain them. you may want someone to watch you shoot or video yourself and watch it to see if you can see somthing you want to change about your form or actions. good luck