It's supposed to reveal the entire head. If by bottom of the head you mean before the edge on the head then it's supposed to roll back further, if you mean after the edge then it's fine.
Mine rolls back equal to the length of my head, if I'm ****ing stiff as a rock, it sometimes only rolls back just over and stretches to the point I don't know it's there.
Ever gotten a bone so hard you couldn't roll it back at all? That's when you know you have a problem.
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