I have been bowhunting for 4 years and practice often but I am still not good at estimating range in the field. I do mark 20 yard spots around my stand but I still want to do more. Unfortunately I can't afford a rangefinder right now to help. My current setup is a High Country ultraforce, it's set as high as possible but only gets about 62-65 pounds. I am using Easton 2514 XX75 superlights with 100 grain muzzy's. The arrows group great but drop 1 foot between 20 to 30 yards and 30 yards to forty yards. I use to shoot the Beman 50/70's and they hardly dropped at all out to 30 yards but they flew terrible. I have a set of carbon Vapor's by Blackhawk, 4000 ACA. They are lighter but I never could get them to fly well or group as tight as the XX75's. I finally found a great bowshop and he has helped me tremendously , but, he hates carbons so he always convinces me to shoot aluminum's. I have killed two deer, one with carbon and one with aluminum and had the same penitration. What do I need to do to get the Carbon Vapor's to fly well? My goal is a very flat shooting arrow to help with my poor distance calculations. I'm assuming this means I need a light arrow. Thank you very much for any advise!!!!!!!