Have you figured out the solution to your leg/foot problem yet?
A few months ago I noticed some on and off numbness in my feet and then some on and off pain in the hip area (on both sides).
There are some L5-S1 disk/vertebrae issues showing on my MRI which may be a direct cause of this, but I suppose the root of all problems is in the overall faulty posture.
Most exercises for the lower spine I tried seem to make the problem worse so I'm not sure how to proceed.

I am progressing to more strenuous workouts for the upper body and these work very well. I regained much of the arm and shoulder strength I lost and stopped dropping things. Scapular stabilization still needs a lot more work though.
I am curious what Egoscue exercises you find helpful.