I have a set of longer aluminum target arrows with lighter narrow bullet points that I crested so that a black line at the edge of the crest lines up to the belly side of my grip. I practice my draw length by looking directly at it without shooting and I suppose, I can kinda see it when I shoot. I have noticed that at longer ranges with those 1918s that am more consistent when I shoot the length where I can shoot 200 grain fatter back tapered points and tag my finger on the draw. All of my wood arrows are either net or I tag the point with my finger, including all broadheads Alaskan carbons, aluminum and wood. I find that keeping wood arrows to a minimum length takes the guess work out of the spine, it seems that they behave differently for different people when there is a lot of extra wood out front. When I make arrows for others, knowing their exact draw length, release strength, bow type and poundage, I can hit the spine on the first try. A couple of times I had to talk them into a heavier head, but that was almost always due to the fact that they had a weaker release than they thought. It gets to be more of a challenge when they pick the head weight in advance, in those cases I want to shoot with them for a while before I select a spine and perhaps do a few test shots with different arrow after their form is stable.