I built a 68" slight five curve longbow, with a bamboo back, Ipe core, and osage belly. This bow shoots awesome, quick straight and powerful at 72lbs. The bamboo is flaking out at a high pressure point. I want to sinew the back and fix the bow. Does anyone know for sure if sinew is only good for really short bows? My thought was to sinew only about 50 to sixty inches and leave 5" or so bare at the tips.