I would add, make sure you are using cut on contact broadheads. With that light draw, that would be a must, preferably a two blade. It also has to be scary sharp. Deer ribs don't amount to anything unless you are hitting them up near the spine. Add a dull broadhead to a light arrow, short power stroke, and low poundage and it may have bounced off the hide.
Pick any quality two blade (there are tons of them: Magnus, Zwickey, etc.), make it sharp, get the total weight up to 450-500 grains, keep the weight forward as much as possible (high front of center), and you should be fine. Working up in draw and/or draw length wouldn't hurt a thing either.
There are lots of people who will help you out here. You came to the right place.