Hi Chestnut,
You may already have this information by now, but according to my research, I think Thomas Ace baptised 6th June 1821 at St. Cattwg Port Eynon is the son of Thomas Ace 1797-1860 and Sarah Hopkin 1801-1843. He in turn is the son of Thomas ace b1769 and eleanor morgan b1765. Baptism/marriage/death records for these people can be found in the parish records for St Cattwgs. I haven't been able to get back any further than the start of the parish records and would be very interested in any further information you might fin.
Best wishes,
Jess