I've been doing genealogical research on my Irish ancestors since 2007, so yes, I'm familiar with the sources you cite and have used them to piece together quite a bit of the Cork story for my family.
Which family names are you researching, when were they Hungerford tenants and what townlands did they occupy?
I have actually had some replies to my online inquiries looking for the Cahermore/Cahirmore Hungerford descendants who still have estate records and am waiting to hear back from the one who probably has most of them.
I don't think most descendants of formerly landed Protestant Irish realize that they could at least deposit copies of their inherited records with the Irish government so that researchers could use them for genealogical and historical research purposes. Since so many records of the poorer Catholic Irish either never existed or where destroyed, the estate records are extremely valuable to folks who are researching Catholic ancestors.Many of the Protestant Irish landowners left Ireland for England, Canada, Australia and New Zealand, as the country struggled for independence and their Catholic tenants bought their lands.
I don't think there were multiple Thomas Hungerfords, but rather one man who inherited several thousand acres in West Cork.The estate was apparently pretty much bankrupt by around 1900 and after his wife, a well-known writer, died, Thomas Hungerford moved with his children to Canada.His descendants appear to be in Canada and New England now and they clearly have some records from the family's estates.Ideally they don't just share those with me and you or the museum in Clonakilty but deposit copies or the originals with the government in Dublin where they can be catalogued and everybody could get access to them.
If I hear back from the Hungerford descendant who seems to have the records I will post again.In the meantime, please let me know which families you are researching.I have a database of folks from that area of West Cork and might have something for you.