Mendozas from 1700's San Luis Potosi

I was wondering if anyone might be able to assist me in continuing my research into the Mendoza family surname. Using FamilySearch.org historical I have been able to trace back my paternal family line (Mendoza) to San Luis Potosi. The last record I have found was a marriage of my GGGG grandfather, Jose Salbador Mendoza, to Maria Bruna Gamez dated 27 May 1812 in the Pueblo de S.Geronimo. The age of Salbador Mendoza is listed as 20 so I reasoned that he should have been born in 1792+/-. This Document list my GGGGG Grandfather as Juan Nicolas Mendoza. Unfortunately this is as far as I have been able to go. I have attached the marriage document should anyone wish to look and see if they might find additional information.