That looks to be a shallow grind if anything.
I'd take all the tape off, and run a full stone progression keeping a very close eye on it. Once you get to the finishing stones you should be able to work the rest of the grind marks out with Crox on a cloth.
Then go back and rehone it on 4 layers of tape again, but this time pay more attention and if it's catching those high spots add more tape.
You can do some simple math to work out your maximum spine width using trigonometry.
split the razor into two mathematical right angled triangles down the spine, and work in 1/2 spine width and hypotenuse (distance from widest part of the spine to the edge). The resultant angle will be 1/2 the final bevel. so for a 20 degree bevel your looking at 10 degrees per side.
Attachment 170332