Have you posted on all other boards that apply to your research? By throwing a wider net possible a VODRASKA descendant should find you.
You might try Leo BACA's 9 volumes Bohemians to America.
Have you taken a look in www.ellisislandrecords.org
or other ports arrival manifests? www.castlegarden.org
to give you a location to work with? Family went to family in the beginning.