Yes, Kelly’s book, Ready to Run, will be an excellent resource.
Yes, they may not have found major errors in your running technique, but it doesn’t take major errors to cause something else to be out of whack. Deviations from proper technique no matter how big or small will cause your body to make compensations somewhere else within the system. You may or may not know that your body is making a compensation.
In the time since that movement screen your running mechanics may have changed.
I would recommend having someone take a look at your running mechanics.
Where do you live?
I may be able to put you in contact with a running coach in your area.
You could take a video of your running upload it to you tube and send me the link in a message and I will take a look at it for you.
“Usage” is a broad term.
Deviations in squat technique and running technique are factors impacting the “usage”
Have you started to address your hip, knee, or ankle mobility?
If so are you seeing improvements?