Congrats on finding Kilmichael!
What kind of record contained the location Kilmichael, in connection with your Cronins, Herlihys or other families? I'd appreciate any years, names or other details you can tell me, and may be able to fill in some other info or sources.
My sister Tracy drew out a townland map for Kilmichael, so we know where its townlands are. So far she has put in three Herlihy locations, I think from Griffith's Valuation, all in Greenville Townland, so 1850-ish.