I have the same problem and have been shooting Trad for 3 or 4 years, but always alone. Then I finally got a chance to shoot with a very good shooter at a local range.
Ken (njloco) watched me shoot and right away pointed out several form issues. One was a floating anchor, another was hunching my shoulders which didn't allow me to get full rotation in the shoulder to get the back muscles doing the work.
He had me shoot some Blind (or Blank) Bale. What an eye opener! When you aren't thinking about hitting anything, (eyes closed), you really feel all aspects of your form. Now I always start a session with some Blind Bale.
I've been using a lighter bow too, about 5 pounds lighter than I usually shoot. It's coming together now. I've added an inch or more to my draw length, and have adopted a 3 point anchor (feather on nose, corner of mouth, and thumb tucked under jaw.
I am confident I'll be deadly out to 20 yards well before the season. Try to shoot with an experienced shooter, or make a video and post it in the shooter's forum for the pro's to look over. I was thinking about that before I was able to shoot with Ken.