On that note, of a heavy arrow holding it's speed better than a light arrow...

The club has a 3D target set up at around 120 yards or so that we lob arrows at for grins. I had the gap figured out with my 2315's. Hold where the bow's shelf is right on the top line of the target and the arrow drops right in. Now, with the carbon arrows that I just started shooting -same length, same 3-under fingers style, same anchor, same poundage, 4" plastic vanes instead of 5" feathers, 130 grains lighter and 25 fps faster out of the bow - they fall nearly 20 yards short of the target with that same gap.

I noticed the same thing in the 80's when I tried switching from 2216's to 2213's for field archery. My pin gaps between 30-40 and 40-50 got a little narrower while my pin gap between 50-60 and all my long distance gaps got much wider. According to what I've experienced, which is backed up by ballistics programs, past 50 yards light arrows start running out of steam, real fast. Not very applicable information for hunting, but it does show how much a little more weight helps hold energy downrange.