> However, in Vespucci there is really no option to change existing data, even my own additions are hardly editable after uploading.

This seems like an error in your setup with Vespucci. It's a full-featured OSM editor, and very powerful (I've heard, I'm using an iPhone, so don't know). I would try to re-install it, otherwise note an issue here: https://github.com/MarcusWolschon/osmeditor4android 