Hey, it maight be that you are still too LOW..did you start fixing your nocking poit FROM center to up?
If you did, you should do it opposite. Put it really high and start shooting arrow where is no feathers. Shoot from abot 10yards.
If you start from center, there comes first a spot where it seems that arrow flies ok, but it is really a spot when arrow kind of jumps balanced way from the rest. The REAL spot comes little higher. That is why it is better to start high and move it down.
This test shows you both, the spine and the nocking point.
Sorry my bad english, maybe someone can tell it easier way.
Take care
and Greetings from Finland.