One thing to note about some of the lighted nocks out there. They are designed to actually move when you shoot so the nock contacts the arrow shaft or a small plunger switch pushes in. That would no doubt effect your tune. I shot nocturnal lighted nocks last year and before I even went to the range I shot it through paper and my arrows would tear way different from arrows with normal nocks. Doesnt matter what you change on your equipment you should always shoot to verify before hunting. Not just because you may miss that buck of a lifetime but you also owe it to the criters your hunting. Just my 2 cents.