Will: You probably need to silence your string. Nocks usually aren't the culprit in string noise.
Re your finger placement on the string. Most folks would recommend a deep hook, i.e., at the first joint of your fingers rather than the tip of your fingers. A deep hook allows you to pull more weight more comfortably, and it's really no more difficult getting off the string cleanly. Just need to train yourself to let go. Don't try to pull your hand off the string, just let it go. The string will push your hand out of the way. For a clean release, you will want to have an anchor fairly tight on your face and back tension pulling on your drawing arm. Then when you get on target (i.e., the sight picture looks good), just let go of the string and your hand should come back along your face.
If you're having trouble holding the weight, 45# would probably be better, but can't do much about that right now unless you want to trade your bow on another or buy another. However, given that the bow is a bit heavy for you, it's important for you to not shoot until you get tired. That will lead to form/shooting problems.
You don't need to look down the arrow. You should be looking over it at the target with the arrow perhaps in your peripheral vision. In any case, you might turn your head a bit more toward the target. Start your practice sessions at 10 yards or so. Then move back a few yards, then a few more. Over time, your brain will learn how to adjust your hold for different distances.
Don't know where you live, but if you're in the southern part of the state, the Wisconsin Traditional Archers is holding it's annual state shoot at the Racine Instinctive Bowmen's Club this weekend. Lots of people there would be willing to help you out. Good luck.