I attempted to take Terri's balance measure and apply it to the new draft as a check.
First, my wife arranged a piece of elastic around my waist. This was placed just under the waist line marked on the toile, and adjusted until it was as horizontal as possible:


Next, my wife measured from the CB at neck seam down to the top of the elastic strip at CF. I am holding the tape in the approximate position (no, I didn't measure myself, and this photo was taken after the measures had been recorded). The measure was 23 inches (to the nearest 1/8") on both sides.

Now I applied the measure to the draft. First, the back neck at the seam measures 2-3/4":

Here is the tape in position on the front, with the 2-3/4" measure placed 1" below waist line on CF:

And here is a closeup of the shoulder, showing the length to neck point (1/2" inside the seams) as about 23-1/4".

Provided the setup was correct and the measures accurate (big "IFs"), insufficient front length should not be the problem.
So, did I do it wrong? Or are these small differences just very hard to measure?