I noticed several caveman and magnetic nbt files are missing quite a bit of structure void. So here's a datapack where I added structure void in a way that makes the pieces fit better with terrain while still leaving open spawn for the buildings themselves. ou can copy these nbt files into your mod itself if you like how these generate better.
adjusted_structure_nbt_files.zip

Issue before was stuff like caveman house was carving a perfect cube out of terrain which looked odd and out of place. These new nbt files rounds out those edges and corners to make it look more natural