When my oldest decided to get her permit in Tennessee I asked her what she was practicing with and she told me a bb gun and I told her to go and shoot her real gun. Well she shoots real well even from the hip with a 38 special and hit the bulls eye quite often hits the target every time, makes me want to go back to a revolver!
You need to do some dry fires with snap caps close to a wall and see what is happening with your trigger pull or grip.
Are you shooting upper and left or lower and right or is it of right of aim or possibly all over the place?
Also did you ever get a holster you like. My Galco riding at about 4 o'clock (Small of back) works well for me and also the girl in the You Tube videos although the Double Phlanx Super Tuck I have also works well just about anywhere I use it!