Glad to see you liked it. I personally am of the Carlson Gracie lineage under Prof. Marcelo Motta. My assessment is your experience shows really that rank in BJJ reflects something valid. Your first school, generally under the same lineage I am, to me seems to be a brown belt closer to getting started in his instructional career. It might be a good resource for mainstream beginners, younger practitioners, and competitors locally. Your school you attended here, with Prof. Portugues is a very well known black belt under a tremendous lineage. He learned the art in Sao Paulo, in a very populated area that is one of the centers of BJJ in the world, and is a top competitor. As a 4th degree Black Belt in BJJ this illustrates a couple decades of teaching, and I am not surprised at the difference you experienced in quality.
Take it at your pace and enjoy the journey.