My arrow is at 18%. I'm pretty sure 18% is close to 19%. Or, do you count numbers different than I do?
I wouldn't doubt it. Your counting has mystified me up to this point. Please give the arrow specs. I suspect that either your numbers are wrong, or the arrow is not spined for a 70 lb draw at at least 28". I wouldn't say this if I hadn't made dozens of these extreme FOC arrows and found them all to be over 600 grains. I've tried to make them as light as I could using several brands of carbon arrows and aluminums. With the aluminums, I have been unable to obtain an extreme FOC properly spined. So what are your arrow component specs?
Just because he did not test arrows under 600 gr does not mean the same principle does not apply.
Never said it didn't.
I'm not really sur why you keep stating it has to be that heavy to accomplish this?
Here's the reason - the components needed to make sure an FOC are heavy - especially the tips. If you can somehow get some extremely light, very stiff shafts (stiffer and lighter than normal carbons), then I'm sure you can get to lower weight extreme FOC arrows - or if you shoot a lower draw weight/draw length. I'm know Ashby didn't do this. If you somehow got a light weight arrow to spine for a 70 lb bow with a heavy tip, then how did you do it?