This is the pic that I'm looking at. There is a lot of horizontal growth that appears to be elevated above the soil.
For reference, I have 6000sf of reel maintained zoysia and 4000sf of common bermuda kept at 1.5" with a rider (non-irrigated and unlevel as hell) and pulled over forty 39-gallon trash bags full of material when I scalped.
How many times did you go over it? I verticut 3 times and scarified twice
I didn't keep count. I just kept going until I couldn't get any more material off @ 3/8". Dethatcher, bag, reel, bag, etc, etc. My fixed blade dethatcher is set to graze the soil.
I don't want it digging, but I do want contact with the soil. Honestly I wanted to try to get lower, but the back was giving out, and my new bedknife was to thick. Any lower would have to have been done with the landscape blade, and that wasn't going to happen.
At this point with the heat, yours should be ready to take off. I would verticut twice more in perpendicular passes, apply fertilizer if you haven't already (or if you are close to a second app) and keep it well watered until it fills in.