I believe that every bow design has its optimal weight. Some cuts of longbows, even Hill style longbows, have efficient weights that will vary. As an example, the same heavy limbed design at 85 pounds can be a powerful magic wand, thry to copy it at 45 pounds and it can be a wobbly slow shooting mess. Or on the other side take a shorter trim limbed 50 pound bow, build something similar, but 30 pounds stiffer and it can be a shocky, stacking dud. then take the same idea, lengthen it a bit go for something 15 pounds heavier and pure magic happens at the same draw length, change that draw length and you could end up with something completely different. If there were such a thing as one perfect design that was perfect at the any draw length and the same for any weight, we would all be shooting the same bow. viva la difference