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Yep arrows spines to heavy, either add a heavier point or thin them down.
You can reduce the dinamic spine by sanding the center of the shaft. Longer shafts help too. For each inch over 28" you can reduce the effective spine weight by 5#. So a 30" arrow that spines at 60# will shoot like a 50# spined arrow. You can reduce the effective spine by adding more weight at the point end. I think it is 5# for each 15 to 20 grains over 128 grains. These number relate to the industry standard for wood arrow shafting but can also be used with hardwood shoots and shafts, cane and "primitive" type arrows.
As was stated,you can sand the center,to reduce spine,but only so far.If a large amount of spine reduction is needed,you can rear taper the shaft and then sand the center portion to create a full tapered shaft.