Coynes from Sandfield (Kilmeane, Killinvoy)

Hello, everybody--new member here.

My Coyne family, which I've traced back to Brooklyn, New York in the 1840s, is genetically related to the Coyne family that lived in Sandfield House, Killinvoy, and our Irish DNA cousins list their farthest known ancestor as James Coyne of Sandfield (1766-1850).  My farthest known Coyne ancestor is Thomas Coyne, b. about 1830 in Ireland.  He emigrated to New York with his brother John, sister Catherine and mother Catherine--the mother probably had the surname of Browne, and her husband was probably a Patrick Coyne.  Thomas and John were painters, and they were in business togethr for a while.  I'm looking for something that will point me to a paper link between the American Coynes and the Irish.  There is some speculation that our ancestor may have been a son of the Sandfield James who married Mary Lyster (James had three known sons who stayed in Ireland, and another James who almost certainly went to New Jersey.)  We also have genetic matches to descendants of this second James.  There seems to be a missing generation, Sandfield James' parents.  Various records list a James Coyne, Esq who was born around 1704 and lived in Clogher, Killukin.  The Lyster family was well established in that general area, I think.  Would it be likely that this James Coyne was the father of the Sandfield James, and of a possible brother named Ferdinand?  (The name runs through the Roscommon Coyne famiilies like a red flag, but there aren't any that I can find in the family of the Clogher James.)  What records might help me find some more Coyne descendants in the early to mid-18th century?  I've checked Betham and got some there, and later RootsIreland has been a good source.

Thanks for any ideas,

Terry (Theresa) Coyne Strasser