I think I am going to start an ERC longbow. I have a super clean stave with no knots on the back. I want to sinew back it anyway just for the experience and to make it a little snappier. The stave naturally has a little deflex. So I figured the sinew would induce some reflex. I like the contrast between the sapwood and heartwood so I want to leave some sapwood. My question is how much? and since it is being backed do I need to follow one ring? Does 60" tip to tip. 1 1/2" at the fades to 1/2" at the tips sound good for a 50+/- # bow at 26" sound about right.