Thompson, The only Drumslieve I can find listed on internet is near Fintown Co Donegal https://www.townlands.ie/en/londonderry/keenaght/banagher-keenaght-portion/fincarn/drumslieve/

no Droim Sliabh listed at logainm.ie Drumcliffe Co Sligo is Droim Chliabh in Irish. Drom Cliabh in Co Tipperary. Droim na Craoibhe in Co Monaghan There is a Sliabh Dhroim na Luifearnaí in Co Donegal.
The name could be an error or it could be a placename that has been forgotten, or at least is unofficial. County Mayo perhaps?
I don't find a Ráth Liabh (Hardiman) either; there is a Ráth Liag in Co Laois. As for Sliabh Buidhe (Hardebeck), there is at least one Sliabh Buí (modern spelling of buidhe, Slievebwee - yellow mountain), in Co Kerry.