I am also descended from a Patrick Cribbin, but mine was from around Cornamona in Galway, just west of Ballyhuanis. I have found that the name was spelled Cribbin and also Curriben. They ended up changing the name in the mid-1800's to Corbett, which, from what I understand, other Curribens also did. I guess Corbett was the English name that sounded the most like Curriben.
Anyway, I cannot help with your immediate family connections, but I have been trying to trace the Cribben name a little bit and have some information that may have some value to you. I have a book called "Mid-Connacht", written by Maire McDonnell-Garvey. In its appendix, she lists leaseholders on the estate of Viscount Dillion (circa 1805). One of those leaseholders is Thomas Cribben in Moneymore in the parish of Annagh. This is very close to Cloontumper. At the time of Griffith's Valuation in the 1850's, Moneymore lists only 5 residents, one of which is a John Cribben (probably a son or grandson of Thomas Cribben) and another is Edmund Waldron. Since your greatgrandmother was a Waldron, I thought there might be some connection. It is a bit of a stretch, but I know that any Irish records before about 1850 are hard to find, so I thought I'd send it along.