It looks to me like you can straighten the bow arm out without changing your draw length.
That Pro diamond may not be the best t handle release to accomplish what you are trying to do.It requires trigger movement to go off.Very hard to get a consistant release with it.I had one and hunted with it quite succesfully and I also have a Chappy boss that has a set trigger,I was going to sell it but I let my daughter shoot it today and it doesn't look like I am getting it back.[

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I actually shoot a Short and Sweet II by Tru Ball(wrist release) and I use a high elbow and backtension to shoot it.I am shooting better with it than any other release ever before.I do use backtension release to practice and keep bt working properly but I just group better with the Short and Sweet.