I had two heavy weights about 85 to where I drew them. Neither one liked the heavy cedar arrows that I had for them, but they both liked the 560 grain arrows that I shot out of my 64 pound bows. That came out 6.5 gpp. I was easy to recognize, I was the guy with a shake and crossed eyes. Dowel stuffed fiberglass arrows from Tink Nathan made a huge difference on how I liked those two bows. With heavier draw Hills it can be a catch 22 with aluminum and cedar if you like to keep your arrows Hill short. The bows like the heavy arrows, but not the stiff ones. I also do not believe that longbows are immune from the trend that extra heavy bows are less efficient than lighter bows. I never had a longbow break from shooting them with lighter arrows. You cannot slip on the ice and jam a tip into frozen ground when hunting with light arrows around 8gpp. That bottom tip will crack with the next shot. I am still curious what those heavy shock monsters would have felt like with a modern string. One advantage of long carbon shafts, enough experimenting will get an arrow that flies, but Surewoods and longbows seem like they are made for each other.