Thanks guys, I guess that rule is correct. A guy on Primitive archer told me, take the childs age and add 10 to it.

So I guess I will knock some poundage off of it. Right now its 10lbs at 10" draw. I want him to be able to shoot it from 4-5.

Here is the tiller so far at 10". I am going to get the outer limbs bending some more. I know when I was a kid, I would have loved a real osage bow.