Hey @SkalOrn! Welcome to the community!!!
So one of the first things I noticed was this.
You have Yaw - (-90) which would just be 90, same as the above “Add float” Node.
Other than that, you should try using a clamp node!
This can be used to bar addition over a certain point and subtraction under a certain point to keep your camera from going too far from it’s desired angle set 
Give that a try and if you need any extra guidance just let us know!