I agree that the heavy arrows out of light bows makes no sense to me, and I’m far from being an expert on understanding everything that goes into the dynamics of arrow flight. I shot recurve for years and never shot anything in a heavy spine, mine are 50#, i’ve shot wood, aluminum & carbons out of them, 50-55# woods, 400 & 500 carbons, and 2016s in aluminum.
When I started shooting longbow, which was a Northern Mist. I called & talked with Steve at Surewood Shafts, who was still there at the time and ordered a test kit in spines from 40-45 to 65-70, and started playing & settled on the 60-65 spine, that is a 52# Baraga. I have since added several more NM to my herd in a weight range from 45-62#, I had a used Classic that was 69#, and shot the 60-65 the best. I have limbs for my Skanee that are 45, 51, 52, and 55#, all seem to like the 60-65s. I do shoot 2018s and have some 2020s that shoot good out of my heavier limbs, but my other NM that are one piece don’t seem to like the aluminum or carbons.
Like i said in the begining, it makes no sense to me, all I know is that I get good flight and the arrows hit where I’m looking…for the most part, when they don’t i’ve either had a bad release, or i’m trying to peek & drop my bow arm. Bad habits are hard to get rid of!!!!
Jason