I also descend from William, Jacob and John Towne as you do, but then we diverge.I descend from Israel, brother of your Samuel.
There is a Towne Family Association which you can join for a nominal annual fee.They publish an excellent newsletter and have historians who track information on the various children of William Towne and Joanna Blessing.
There is also a book "Descendants of William Towne" available.I purchased my copy from Barnes and Noble I think.There is also a PBS-aired video "Three Sovereigns for Sarah" which covers the witch trials that involved three of William and Joanna's daughters. I think I also purchased that from Barnes and Noble.
In other words this is a very well-researched family with a wealth of material available.The Towne Family Association also discusses common errors that I have seen published in less well documented genealogies.