Not much help with South Stoke PRs im afraid except to add this to Richards marriage. His occ was a yeoman and wits at their wedding was Walter Porter and Mary Brown.
I went back to Oxfordshire Marriage Index and hope the following might help....
24 Sep 1739 John Ham to Ann Hart at South Stoke
16 Nov 1764 John Ham, yeoman, to Keziah Lukeman at South Stoke
5 May 1788 Richard Ham to Ann Burges, w, at South Stoke
12 Oct 1795 Thomas Ham, Goring, to Jane Hamblin at South Stoke
17 May 1800 James Ham to Mary Butler at Goring
5 May 1832 William Ham to Sophia Kirk at South Stoke
And the female marriages
21 Dec 1767 Mary Ham to William Edgerly, yeoman, at South Stoke
5 Nov 1778 Ann Ham to John Wheeler at Goring
29 Jun 1788 Elizabeth Ham, w, to Richard Stream, w, Moulsford at South Stoke
2 Sep 1799 Elizabeth Ham to William Butler at Goring
These are all the Ham marriages in Goring and South Stoke.... Sorry i couldn't be more help

Sue