Sight is fine; it's good that you are aware of your limitations and willing to do something about them, rather than just flinging and hoping for the best. If you can find someone who is a certified coach of the Oly style, that would help you more than anything. If you get the form down cold, everything gets easier and more predictable. If your anchor, position of the string relative to your eye, and draw length are varying from shot to shot, and you are recruiting the wrong muscles to draw and shoot, you will find it very hard to consistently hit anything with any aiming style. If you get a pin, you must have your eye in the same relative position at anchor to the pin every time in order for it to work properly. On a compound, the peep does that, of course.