Lomelis from Tecomatlan, JAL

I am new to genealogy and one of the lines I am most interested in is my maternal Lomeli line, which is also proving to be the most difficult. I have only been able to go as far back as my 4th great grandfather, Rafael Lomelin, who married Anacleta Enriquez. They had 4 children, Margarita, Juan, Diego, and Cipriano all born between 1830 and 1845 (their children and grandchildren settled in ranchos in Juchitlan, JAL). From my research, I have discovered that they originated from Tecomatlan, Jalisco which belonged to the parish of Tototlan. Unfortunately, the parish records for Tototlan appear incomplete as there is a huge gap of time missing. The baptism records jump from 1824 all the way to 1883. In addition the baptism records start at 1818 and I estimate Rafael to be born a few years before. Does anyone have any information about those missing Tototlan records, where I may be able to to find more information , or is this brick wall impenetrable?

I have also read previous posts on this forum regarding descendants of Carlo Lomellini who originated from Genoa, Italy and settled in Jalisco. I wonder if perhaps I descend from this line?

Any help or suggestions would be greatly appreciated!

Thanks,

Juan