Well, you already know the shooting qualities of the 3D, so that's a baseline. Go try the other two and see how they feel to you. If they start eating your arm off, or if you have a hard time putting two arrows side by side, then you know your form demands a higher brace height.

I am not one that believes in changing your form to suit a bow. I've tried that too often and had too little success at it. Buy a bow that suits you.

Personally, if I had a bow that new, and liked it other than the draw weight, I'd swap out the limbs and have done with it.

Good luck with your back and shoulder.