Arlo - I like to keep the top of the grip hand and the arrow (on its rest) as close as possible. That being said, the 1/4” above center is approximate, and I will still be laying 2 layers of accent onto the shelf after its been cut and shaped. Depending on the rest used, the arrow might be closer to 3/4” above. “Standard” in my opinion means a generally accepted norm, its not a rule, so anything that works well goes.