You don't need to concern yourself with how thick or how thin, thats what got you in trouble before. You are only concerned with the bend. Get it bending evenly across both limbs, if you are too thin in those spots your bow will just have to be lighter than you hoped but get it bending evenly first thing, even if it is way too heavy. Forget about thickness, you have no need to measure thickness on a self bow unless you are just curious.