Nothing like a late reply. I saw your post and know we are related as my GG Grandfather was Martin Kastl. I am from the San Francisco Clan and your names of relatives all line up. My grandfather was Henry Kastl, Martin's Son. Henry is deceased as well as all but two of his children- Robert Kastl and Muriel (Molly) Kastl.
Feel free to contact me and share. firstname.lastname@example.org
Frank L Kastl