You would probably really like this black cement video from her other channel, if you haven't seen it already. It was quite powdery. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-ZzC6rxcluvk.html
Make your textures more hard. Not stones or white stones in it. More powder & more crunch. So u can crumble properly like your previous textures in your old videos.