Let the force be with you Luke...
When I try to use mechanical aids like sights, or even using the arrow as a sight, my accuracy and consistency suffer. Your eyes, brain, and the rest of your body can be trained to shoot arrows amazingly accurately without any artificial aiming aids. You just have to get your conscious mind out of the way and let your subconscious and instincts take over. Here are the most important aspects of instinctive aiming to me:
1. Consistency. Always draw to the same point. Mine is my thumbnail touching the corner of my mouth. I shoot with both eyes open, and focus my eyes and mind on the small spot on the target that I want to hit. The arrow is in the periphery of my vision, but I don't look at it. What I'm doing is pointing my bow hand at the target. Maybe my mind is referring to the arrow and other things, but I'm not aware of it.
2. Focus on a SMALL part of the target. This is really important. I think a lot of people find that they shoot better at small targets than they do at large ones. The trick is to focus your mind and your eyes on a small object on the big target. This is really important when hunting.
3. A good release is the most important part of good shooting. It's also the hardest part to master. I've done it very well at times, and very poorly at others. That's why mechanical releases were invented. I shot fingers with a tab for most of my life. Then I broke my middle finger and either had to stop shooting for a while or dig out and old mechanical release that I had. My accuracy and consistency improved 1000%. I know a lot of traditional archers will consider me a heretic for shooting with a mechanical release. So be it. What I really love is seeing my arrow smack that can, cowpie, stump, ant hill or rabbit. The mechanical release is a hassle to use, compared with fingers and a tab, but the release is absolutely consistent from shot to shot. And I've never shot better.