Guess I'm the 1%. Because that's the ONLY thing I changed. Everything else, including tank decor and plants is identical.
90% of the time it is not the soil it is what we do to the tanks, and water
I would like to know if my parameters are ok
They look good to me, hence my thoughts about the FSS. My tank was also "perfect" when I ran all the tests. Aquasoil takes about a month to stop leeching ammonia. You could probaly cycle the Aquasoil in a bucket with lots of water changes and then do a rescape.