As a leftie, you would get a false nock right rather than a false nock left if your bare shaft were way too stiff, but otherwise my post would hold.
Having your string elbow too high can cause you to press down on the nock at full draw with your index finger, when you're shooting split fingers. This causes a bend in the shaft, that rebounds up when the arrow is shot, which can give you a false nock high. You should try to keep your string forearm in line with the arrow, or just slightly elevated, no more than 5 degrees or so.
If this doesn't solve your problem, then just set your nock at 1/2" and enjoy shooting your bow. It can't be that far off at that nock height.
And think of some excuse to get away and join us at Rod Jenkins shooting school in Idaho on June 21. He'll straighten you out.