Change the definition of your Directory Server to “Other”. Then change the Login Attribute to “sAMAccountName”. Test the connection and save it.
If you previously enabled User Provisioning, you should be good to go. If not, create new BFI users with user names that match your domain login names, and associate them with the correct roles.
You can then delete the unneeded users. Note that Saved Reports are associated with the previous user, so you may want to make backup copies as the non-ldap administrative user, and make them public so the “new” users can still see them.