It's still "skipping import, as distro name already exists". Where is cobbler keeping this information?
Check "cobbler distro list" ... though you've removed the datastore you still have configuration in /var/lib/cobbler that the RPM will not (for general reasons of being a good citizen) not remove when you install the package.
You should remove these with "cobbler distro remove --name=Fedora-10-i386 --recursive" once you have the package reinstalled. Try to avoid editing that configuration directory manually as it leads to some bad/dangerous habits.
Ah, that was it. After running "cobbler distro remove" the subsequent import worked. Thanks!
Tim