Romo de Vivar in Aguascalientes

There were several men named Francisco Xavier Romo de Vivar in Aguascalientes in the early 1700's. My research is focused on the man that was married to Juana Dias Montanes de Sandi. I estimate he was born between 1700 and 1715. I've identified three individuals that appear to be the children of Francisco Xavier and Juana.

Lazaro Salvador who was baptized Feb 26, 1748
Antonia Leandra who was baptized April 6, 1742
Ana Maria who was married in Teocaltiche on Jan 22, 1753 (probably born around 1735)

I believe, but cannot prove, that Francisco Xavier is the son of Nicolas Romo de Viva and Francisca Xaviera Gallardo.

It is equally possible that Francisco Xavier is the son of Cristobal Romo de Vivar and and his first, Josefa Macias. Following her death Cristobal married Maria Munoz de la Barba.

I've pretty much been able to rule out all other possibilities, but there may be someone I missed.

I have looked though most marriage and Informacion Matrimonial records looking for some document that confirms the names of the parents of Francisco Xavier (again keeping in mind there are others by this name that are not of the right age). So far no luck.

If anyone has come across any record that can aid me in my research please let me know.

Thanks.