Olivares from Aguascalientes and Zacatecas

I have hit the proverbial brick wall with my maternal Olivares line. My great, great grandfather Jose German Olivares married Sacramento Muro in 1858 in Rincon de Romos, Ags.
They had 3 children all born in Rincon de Romos:
Ignacio Olivares Muro 1860
José Sostenes Olivares Muro 1863
Rosalía Olivares Muro 1866
Jose Matias Olivares my GGGG married Margarita Barrera in 1821 Rincon de Romos, Ags
They had 8 children all born in Rincón de Romos, Ags
José Eufemio Olivares Barrera 1822
Ancelmo Olivares Barrera 1825
Petra Matias Olivares Barrera 1826
Maria Epifania Olivares Barreras 1829
Maria Marta Olivares Barreras 1831
Maria Catarina Olivares Barreras 1833
José Trinidad Olivares Barrera 1836
José German Olivares Barrera1838
José Gabriel Olivares married Ma. Rafaela Cervantes 1797, Rincón de Romos, Ags
Their children all born in Rincón de Romos, Ags
Francisca Dionicia Guadalupe Olivares Cervantes
José Matias Olivares Cervantes 1802
Jesús Olivares Cervantes 1805
Felipe Olivares Cervantes 1807
Juan Olivares Cervantes 1809
Norberto Olivares Cervantes 1813
José Roberto Olivares Cervantes 1815
Maria Felipa Olivares Cervantes 1819:
Jose Miguel Olivares married Maria Antonia Flores about 1779 I think in Aguas.
Their children:
José Gabriel Olivares Flores, born 1780 San Luis de Letras, Aguas.
Maria Martina Olivares Flores 1790, Tepatitlan de Morelos
Juan Clímaco Olivares Flores 1794, Pinos, Zacatecas
José de Santa Marta Olivares Flores 1798, Pinos Zacatecas

This is where I am stuck, I have looked up the church baptism records for all of Jose Miguel Olivares’ children and none list the grandparents. Where can I go from here? Any suggestions would be appreciated.
Nececito ayuda con la rama de los Olivares
Gracias por qualquier asistencia que me puedan dar
Aurora DeAnda Olivares (de Romo)