ORIGINAL: Dopler
Carbon arrows arenot a quality product, they still don't have the technology to make a carbonarrow with uniform wall thickness yet, sure,it might be straight but each arrow will flex differently in flight due to thin/inconsistant areas in the arrow wall, that's why broadheads won't fly in most caseswithcarbons when you get over 260 FPS.
Tell this to the olympic shooters (I believe they have a 60lb and 280 fps max). See if you can find one that was using aluminum. The reason vegas shooters use aluminum is only because aluminum arrows come in larger diameters.