I'm having trouble when I draw back my bow. The peep sight doesn't open up all the way in order to see the sights. (It makes an oval instead of a circle.) I move my loop for a temporary fix, but it's annoying during practice. A hunting buddy said i needed some more twists in my string to fix the problem. Will this work? How many twists? I know very little about bows other than how to sight and slightly tune. Thanks for the imput.