If you have access to a safe place to do this, and make sure to control the bow, this is a sure way to test back tension:

Stand close to a target (15 feet). Come to full draw, hit anchor(s), and hold.
Now tilt back (aim at the sky, 30-40 degrees) hold.
Tilt back to level. Hold.
Tilt down as if shooting from a treestand. Hold.
Come up to horizontal and release at target when ready.
If you feel tension in the neck or triceps, shortening of draw, or poor release you are probably not using proper back tension, nor are you bending properly at the waist.
This should be a six to eight count cycle.
This is also a good test for bow weight and ability to manage it.

Hey I know Ron, are you sure he can read a ruler  

   

If you ever around Mike Fedora let HIM check you ..LOL...that will be a REAL EYE OPPENER.

Sorry duplicate ..

You are not alone.Most people are shooting arrows spined for Bows 10# less.