I use my bow holder and an archery level set to determine my nock height. Most of the time my eyeball is pretty darn close. Then I use a little homemade "L" shaped gadget that I determine my centershot. Again eyeball is pretty close.
I appreciate you going through the trouble of showing how you set up your bow. But you do know that these setting are not set in stone (excuse the pun). They are initial settings that give you a starting point. Fine tuning is always required normally by adjusting the rest ever so slightly according to how your particular arrows fly (see the sticky post at the top of this forum) until correct arrow flight is achieved.