Form related, vertical bow or string torque could throw the arrow nock high. If you grip the bow fairly loosely, bow torque shouldn't be an issue. If you grip it tight, with too much pressure on the throat or heel, you might be torquing it vertically. If that's the case, loosen up a bit and see if that helps.
Vertical string torque can be caused by out-of-proportion pressure on the string by the various fingers, usually too much or too little on the part of the index finger, if you're a split finger shooter. Try to be aware of your finger pressure and try to equalize it somewhat. The ring finger usually doesn't apply as much pressure as the two above it.
A high drawing arm elbow will put downward pressure on your index finger and can also cause the arrow to come out nock high. If you have a high elbow, might try lowering it a bit.
If you're using only one nocking point, the arrow could be slipping on the string. Try two, one above and one below the nock, if you're not already
All this being said, it seems like you're pretty close as is. If none of these things remedies the problem, just fletch them up and shoot. Good luck.