Other than FsRealistic Ambient Wind, another possible cause of that might be scenery objects with crash boxes, which should be easy to fix with a custom pushback route.
Another possible cause are "bumps" in sceneries like elevation changes that shouldn't happen on a flat apron, these can only be fixed by the scenery developer, since in real life pushback will never allowed on a sloped or bumpy terrain: especially with a towbar, it will likely be damaged.