Can someone diagnose my Bermuda problem?

Some areas are growing higher, thicker, and dark green, but there’s another section in the middle that will not grow, is not green, and only seems to produce seed heads.

Based on a previous thread, is the soil just too compacted? We parked on that area for 3.5 years before there was any hope of grass growing (all shade previously).

Additionally the dark green edges have a bit of material added to them, some topsoil, some sand, some river silt (as you can see). Perhaps this explains why the grass is darker green?

It was all fertilized in August with 13-13-13. Just once this year.
I’ve mowed every 2-4 days since August using an Ego rotary at lowest setting (1.5” HOC).

Pictures:


Vs.



The bigger picture: