I have basically the exaact same story.
Mine was L2-L5 MILD
It got worse for awhile after the surgery, Couldn't even hardley get around on a walker.
I was told that the area can fill with blood and cause more pressure.
I got prescribed prednesone and that helped get back to pre surgery pain levels.
I did not have any improvement until week 5. It was depressing.
Now my left leg improved a lot but not the right.
Hang in there and give it some time.
Good luck