I know this was posted a while ago, so you may have already found your information. However, check out family tree volume #38 tree #184 (http://www.genealogy.com/wftonline/v38/0151to0200/v38t0184.html) Look for piotr. That is the Polish spelling of your great grand father Peter. According to that tree he married Dorota (Polish short-had for Dorothea) and had numerous kids, including an Andrew who married Antonia. I hope this helps.
In addition, if you have any information about the following Adamczak's in your searches, I would greatly appreciate to know about them:
Brygida; Born 1935 Ewa (Eva); Born Oct 19, 1958 Franciszek; Born Sept 25, 1958 Died: Feb 18, 1990 Janina; Born May 22, 1942 Konrad; Born Apr 4, 1932 Died Nov 20, 2001 Natalia; Born Jun 7 1976 Regina; Born Aug 31 1948
Also, I have an unknown Adamczak who married a Gertruda Zarcharias and had atleast one kid Brygida.
Once again, I hope this information helps, any maybe we share some family in common! Thanks.