As I say, Griffiths does not list any Wade family in Congo in 1860. I searched on Charles Wade. There is only 1 listed in Co Tyrone for that same year. He was in the townland of Drumey where he had a house, offices (outbuildings) and 5 acres (plot 3). There’s no Wade family there in the 1901 census, so perhaps the family moved from Drumey to Congo between 1860 and 1886. The revaluation records would tell you when the Drumey property was given up, and when the Congo one taken on, and by whom.
Here’s a link to the 1st Presbyterian Church. However you may find it easier to look at the records at PRONI, especially as there are evidently other relevant records there too.
http://www.presbyterianireland.org/congregations/dungannon.html