HI Liza - It's good to hear you had a successful trip. I hope to hear more about your findings and experiences.
Regarding the different spellings, I'm still trying to find some connection between my family and the McRandles still living in the Larne area. They seem to derive from a Bernard and Hugh who lived in the Cairncastle area in Antrim - but I can't find a anything to link them to the Feystown folk.
All the best