I used to go with the nock point under, but now I do over and under. That way there can be no mistake and no movement during the shot. Slomotion video shows that the arrow can slide around after the release but before it leaves the bow. I use tie on nocks made from string serving material. This is lighter and less bulky than brass crimp on nocks. The only downside I see is in using arrows with different sized nocks. If the two string nocks fit snugly around a plastic nock, they may be too narrow for a wood self nock.