The Aldila NV 65 is the stiffest overall profile of the 4 you listed. The Mitsubishi C6 Black is the most flexible. 21 cycles variance between those two in the butt frequency and the NV65 is stiffer throughout the entire shaft. The NV55 and UST Recoil 660SC are basically identical in the butt section frequencies, but the NV55 is stiffer in the tip compared to the 660 SC. These two are about 15 cycles more flexible in the butt than the NV 65. The NV55 and the NV65 are similar in the tip stiffness, but the NV55 is more flexible in the butt section. The deflection numbers tell the story. The Mitsubishi deflects the most, followed by Recoil 660 SC, then the NV55 and finally the NV65, which deflects the least. The MCA C6 Black should produce the highest trajectory since it is the most flexible in all sections of he shaft. Recoil 660 SC should be the next in trajectory height, followed by the NV55 and hen the NV65, which should have the lowest trajectory of the 4 shafts, based on it’s frequency profile and deflection profile.