Looking for some input. Would this work? What would be the disadvantages?

1. Set-up the bow up for mechnical centershot with an EZeye.
2. Set vertical tune with nock or rest height.
3. Cut and fletch a appropriately spined shaft (err towards stiff) about 2 inches longer than required.
3. Shoot the tuning method of choice (broadhead in my case) - knowing the shaft will most likely show weak dynamic spine initially.
3. Cut a 1/4" off the shaft and repeat step 3 until the tuning method shows optimal spine/tuned.

Keeping the arrow in line with the string makes more sense to me than moving the rest.

Thoughts?