I have to believe that we are related. I'm researching my Gunning ancestors, and I've tracked them down to Thomas Gunning b: Abt 1825 d: 1902 in Ballindoon (East shore of Lough Arrow), Killadoon, Co Sligo (my g-grandfather). His father was James Gunning b: Abt 1800. I believe Thomas had a brother John also. I still have family in the Lough Arrow region, but they have not made a connection to other Gunning families in Co Sligo.
Griffith's valuation (1858 for Co Sligo) has a James, Thomas, and a John Gunning located in Ballysadare, but I don't know if they are the family members above.
I'd be most interested in learning what you know of the Gunning family from Co Sligo, and specifically Ballysadare. I've had contact with another researcher with Gunning family traced back to Riverstown, Co Sligo.