I think I've found something that works for me to make sure I'm reaching a full 28" draw.
I have measured off at least two dozen at 28" and marked that with a ring drawn on the shaft with a black permanent marker.
I can see easily when I've reached my mark. I also practice drawing in the house by putting a clothespin on at my mark then drawing back with my eyes closed.
I have found that it didn't take long with these two methods and my draw and anchor were becoming more consistent.
The end result is that my arrows are hitting my intended target more consistently.
God bless,Mudd