Yeah, my post got deleted also! But I had it copied
! Here you go..................
Not knowing your wood's MC is a major clue, at least to me. Your drawn profile looks perfect for the rectangular limb design. Sometimes it's just the luck of the draw with these here wood bows.
Most moisture meters are useless IMO. Go get you a good 7-10 bucks temp/humidity gauge at a hardware store or Wally World. Knowing the correct R/H (between 40-50% for most woods and will give you 8-10 % M/C) where you store your bows/wood is paramount for repeated success.
To get that length bow to open up a little more for a longer draw, you can do as other suggested and make your bow longer. Or change designs. You can shorten the rectangular section back up to about a third and pyramid from there. Keep your tips stiff just like you did with this one. Good luck........Art B