If you have not done so, investigate one of the online genealogical web sources. In addition to the databases of historical records that some of them have, you can also connect with other people who are searching the same or related lines, and many people allow their trees to be searched and viewed. Given that your GGF had ten children, the odds that a descendant of one of them is also doing research on the family are high. Most of the sites also have message boards where you might get a better response to a query about specific people than here. If you do not want to spend the money for a subscription, check to see if your local library maintains a subscription for free use by card holders. The same caveat applies to online services and printed records: don't believe everything that you read. Verify everything that you can before you accept it.

Good luck.