i think your long string is a little bit waaaaay too long. it's deceptive.
with the long string, pull til you feel some tension in the limbs, then, if you can draw it the equivalent of a normal brace height (say, 7 inches past where the feeling of limb tension set in), then go to a very slight brace...like 2 inches. You want to brace it as soon as you can, but low. This will show you what the limbs are doing, but in a safe manner. Then you can work out your hinges, and as they disappear, you can gradually increase the brace height to 3", 4", and on up to 7" or whatever.
Looking good so far, man. How thick is it and how wide? Is it a direct taper from the fades to the tips, or do the limbs run parallel partway?