The Ready State Virtual Mobility Coach is like having a virtual Kelly Starrett in your pocket.
Tight hamstrings may be a symptom of anterior pelvic tilt.
The hamstrings are trying provide stability to the pelvis.
Have you done a search of the archive for hip extension or hip flexors?
There are several which address these.
A couple to start with
How to Fix a Pelvic Fault or Tweak