I think the issue with short drawing comes from not maintaining good form and failing to fully expand at full draw. I was amazed how some guys had their draw length increase by inches at one of Rod Jenkins' clinics because they improved their form and shot from a good position. I am a solid 29.5", and I hit it almost exactly on every shot because I am fully expanded and cannot get the string back any farther if I have my dual anchor point firmly in place. Much of what I have seen that contributes to bad form is snap shooting or using such a high weight that the shooter either cannot fully draw the bow or collapses his body when trying to hold at full draw.
I think the shooter needs to start with a light bow (10 pounds lighter than what is thought to be comfortable) and draw the bow, anchor, and then continue to expand by pulling the elbow all the way back to the point it starts going to the left (for a right-handed shooter), while squeezing the shoulder blades together in the middle of the back. Have a friend pinch his fingers on the arrow where it meets the opposite side of the shelf, and pull the arrow off the string. Then measure from the deepest part of the nock to where the friend's fingers are on the arrow. Do that several times with the light bow until the longest consistent reading is reached. That should be the correct draw length, no matter what weight bow you shoot. Now repeat that same process with a normal weight bow to see whether you are getting out to full draw. Many people will find they don't. Part of that problem is strength, and part is routine/habit/muscle memory. Practice a lot with the lighter bow to get your form consistent while pulling heavier bows or something like a BowFit strictly to build strength. A Formaster also helps to make sure your form is correct, as will a good instructor/coach.
Ken -- I bet if you do those things I just suggested, you will find your draw length increasing to well over 23.5". You can't be THAT short, especially if you were actually drawing 28" with a compound! :eek:
Allan