Leave the nock point close to what you have it. You may want to move it up or down maybe 1/32 -1/16th. Howats love a high nock point. To really find its sweet spot you need to send a bareshaft.
In regards to accuracy, stop aiming your bow. Pick a spot, look through it, release.
Don't fret accuracy yet until you have really dialed in tuning that bow.
I always measure nock height from top of shelf to top of nock on arrow (bottom of nock point. But if thats correct I don't know...
Joshua
BTW, when I got to the testing broadhead part of tuning my groups were about 12 inches large at 20 yards. Two twists of the string and they shrunk to 4 inches.