Actually, they fly perfect with the 125 grain points and total weight of 509. The dynamic spine is at 72.8. My bow dynamic spine is 70.3. I might try 145 grain points, it'll bring the dynamic spine to 67.2 and arrow weight to 529, but if it works, I can use my existing 140 gr. broadheads. I do not plan to cut them unless required. My DL is 28" now, I tested it without a bow and figured, if it changes, based on my body structure, it'll max out at 29", if it ever gets there. So, 31" arrows are a safe bet for now.