Good Afternoon Gary,
Francis Hopkins (1710 - 1760) is my 7x great grandfather. I am descended through his son Francis (married to Sarah Lamball) who is the eldest brother of your Benjamin.
I am most interested in sharing info with you, although it seems you've already touched most of the bases!I have some copies of wills which I've downloaded from National Archives.
Hope to hear back from you.
PS. quick reference to Mary Fuller...an Elizabeth, wife of Benjamin is buried in Milton in 1717 and then Benjamin's consequent marriage in 1718...just thinking this may be the Fullers we're looking for because of the similar name of Benjamin.