Probably the opposite. Persistent nock high can be caused by excessive downward pressure of your index finger on the nock, which causes the arrow to deflect down and then bounce up, which causes a false nock high. It's hard to avoid with a short bow and a long draw length. However, the way to avoid it is to relax your forearm and hand and draw with your back muscles, such that the force of the draw is straight back and not slightly up or down. If you have a high drawing elbow it can cause this problem, but the solution is not to lower your elbow, but instead to draw with your back muscles and relax your arm so that your elbow comes into alignment automatically.