Over here in Houston, XEABC in the Mexico City area (Radio Canon) is usually the dominant station on 760, with WJR underneath. The other common Mexican station I hear is XEDGO in Durango, which I can sometimes hear in XEABC's null. I've never ID'd XERA here. I believe
@jim-satx is more fluent in Spanish than I am and may have ID'd other Mexicans on this frequency or have some other ideas about what's possible in your area.
I have also heard KMTL in Arkansas with Spanish language programming around sunrise and sunset.