Good to hear you are seeing improvements in every day life.
Yes, the spine is the place to start.
Then move to the primary engines of the hip and shoulder.
Your hamstring situation could be a downstream impact of something going on at the hip.

Now that you are more aware of your forward head position you can address this.
Adjusting your body position when moving to see something. Working within the conditions.
Undoing the impact of the situation.
Episode 169: Forward Head On Neck Position
Episode 130: One million Episodes Viewed!

Episode 109: The Neck of a Desk Warrior Poet
Jill Miller and Your Dys-Supple Neck

Did the ligament or tendon tear with the fracture?
Have you seen a doctor since the fracture?
Have you seen a practitioner about your back and ankle current situations?
Stiffness with upward/downward movement of the ankle?

The hip, calf and hamstring can be upstream compensations of what is going on at the ankle.
The calf is impacted by what is going on at the hip and ankle.