If you're bending your drawing hand, it's because you are using your arm muscles rather than your back muscles to draw the bow. If you've been doing this for some time, it could be a difficult habit to break. Probably one of the world's experts on using back tension to draw the bow is Rod Jenkins, a contributor to this forum. He spends quite a bit of time on this subject in the video Masters of the Bare Bow III.
Perhaps over-simplistically, since I don't generally have this problem, it helps me to visualize my forearm as a chain connecting my elbow to my fingers. As I draw the bow, I can feel the links in the chain come tight as the chain straightens under tension. Even though I've learned to use back tension, there are times when I get tension in my arms, and I have to go through this visualization exercise to get rid of it.
Generally, people move to a deep hook to help them relax their forearm, so I don't think less of a deep hook would help. I learned from Rick Welch, who believes that placing the sring further forward on the pads of the fingers rather than in the crease of your first finger joint promotes a cleaner release. I find that I can do this and still have a relaxed forearm and hand with lightweight target bows, but as I shoot a heavier hunting bow, I find that I have to move the string back into a deeper hook to keep my forearm and hand relaxed.