Give this one a shot. Will does a good job describing that your shoulders and feet should be in line with one another based on the type of shot you're trying to throw.https://www.youtube.com/watch?v=0Vrqk5dUgU8
While facing the target, it looks to me like your right foot is way too far over and is causing you to essentially close off your stance. It's very similar to a normal golf swing in that you are unable to open up your hips and follow through. I believe your original post indicated that you're experiencing an early release. Take a peek at Will's video (specifically beginning at the 7:10 mark). It's pretty new and I think it'll help explain how you should be set up depending on the type of shot you're trying to throw.
Oh, and get that left hand off the disc!