since I've changed to shooting with glasses, I've had to make some minor adjustments to anchor point and also played some with nock point.

I am closer to 1/4" like chad but I seem to get a wide range of accpetance out of my old crusader. I dont play with my new one to much but it is also the same way as to nock point.

Make sure you are not getting bad feather clearnace. I've noticed that from time to time. The more I play with rotating my cock feather up (towards upper limb) the more the lower hen feather contacts the riser and I do get a considerable kick that wont go away, its very consistent, 10 of 11 arrows fly like darts and that one kicked till I fixed it.