I find using multiple throwing styles helps to keep me playing well. When my side-arm is bad I throw more backhands, and vice versa. If both are doing bad then I start chunking thumbers all over the course.
If you play the same course over and over again you begin to build up expectations for how you should shoot on the course. You then tighten up, shank drives, miss putts all because you are putting pressure on yourself to perform in a casual round. You may also be "aiming" too much instead of throwing. Loosen up, grip it and rip it and maybe get out to a new course to give you a fresh look.
Lastly, if you are having trouble controlling your throws work on one thing at a time. If you are shanking your discs to the right, throwing nose up, and throwing too short, it will likely complicate things if you try and fix all those things on the next throw. Simply focus on one thing, then slowly piece your throw back together.
Good luck sir!