I have found with cedars that having a lot of extra length is a variable that is difficult to prdict from bow to bow or from shooter to shooter. Here is one example. I have a friend that is changing his draw alot from bow to bow. I gave him longer arrows that were stiff enough to match his strongest bow that he draws longer than his lighter longbow. They would not fly out of his longer longbow. He broke a couple, they were long enough that I could put blunts on them, but he would be drawing the point onto the bow. To my surprize he found his groove and was shooting those shortened blunts out of his lighter longbow, they should of required a much lighter spined shaft. However, they were flying perfect. He tried the longer broadheads, that were now just the right length and they flew good as well. The math says that the super short net length arrows were 10 pounds spine stiffer, but they flew exactly like the broadheads.