I've been able to substantially cut down on the dizziness by adjusting my first rib. Adjustment techniques have been discussed elsewhere on these forums. You can search here, on google and youtube if you need more info.

I'm doing 3 sessions per day, 5 mins each. Yesterday I adjusted the angle to be a little deeper.

I have fewer symptoms all around, whether it's back pain or TOS, but it's a bit early to declare victory. Today is day 10.