Use this lat stretch to eliminate the need to bend your arms in the backswing and try this over the head hip and torso stretch to increase the separation between your hips and torso to make a more powerful swing
Do not practice before a round the same way you would if you were working on your mechanics, get target oriented and play a few shots with ever odd or even club to a target, then play with the swing you have that day do not try to change it prior to the round
Use your eyes and vision to change your ball shape by getting your torso on top of your lower body to cure your hook