I've tried that, but the openmaptiles spec and protomaps spec just don't provide enough details to be able to display a detailed map like the OSM raster tiles.

I've tried that, but the openmaptiles spec and protomaps spec just don't provide enough details to be able to display a detailed map like the OSM raster tiles. That's not to say that maputnik isn't great; it is! It's an awesome frontend to the complex style files.