There are many different styles out there, and everyone has to use what works best for them.
I have noticed some that draw past their anchor and then settle into the shot. Sometimes reducing their draw length by a couple inches. There is a lot that can be learned by marking your arrow even with the front of the bow when at full draw, and then shoot that arrow while recording your shot. Most will see that when they watch the video, that their draw is short of the mark. It is a very good learning tool.
When I started shooting (a long time ago) I thought I had a 28.5 inch draw length. All the arrow charts gave me too stiff of an arrow. I always had to go with a lighter spine to get my arrows to fly right. After years of shooting I started working with a video camera, and noticed my 29 inch arrows were sticking over the front of my bow by 2 inches. I realized that I had a 27 inch draw. I then tried to increase my draw length because I thought as tall as I was I should have a longer draw length. After a few years of playing around with it I realized the 27 inch draw length is what works best for me.
I draw back to my anchor, and slowly expand until the feather touches the tip of my nose, which make my draw 27 on the dot.
Now I just order my bows at my desired weight at 27 inches, and tune everything to the best of my ability.