i agree, try making the buildings out of CNCT or CLST
It doesn't make anything btw. You should make a city out of light powders, and don't make too much ground there. A few poxels high ground is totally okay! Then, you will see a better result than "you can see it moving in fance view, but it doen't destroy anything". I still haven't disliked, because I'm sure you can make it better!