Hi
Sorry, I have not read the whole tread but I noticed you mentioned the Ancestry Irish Collection - from reading the newsletter the other day (and scrolling right to the bottom of the article) they mentioned the following information:
Counties with representation in these three collections include: Antrim, Cavan, Cork, Fermanagh, Galway (marriages only), Kerry, Kildare, Laois, Louth, Mayo, Meath, Offaly, Roscommon, Sligo, Tipperary (marriages only), Tyrone, Westmeath, and Wexford.
Perhaps this may help?
Regards