You are doing it right!
I normally don't join in the group back slapping that goes on around here, but I just wanted to say that you are traveling through Mexico on your stomach, and that is the right way to do it! Well done, sir!
I have eaten in a lot of countries, and in my opinion the food and food culture in Mexico is as rooted in history, nuanced, complex and delicious as anywhere, and frankly more so than most.
I spent a few years living in Central Mexico (Mexico, Hidalgo, Queretaro, Guanajuato and Oaxaca). Most tourists totally miss out on the best parts of Mexico by skipping straight to the beaches and resorts. I especially like that you are taking the time to make friends, which is another thing that your casual vacationer misses out on: people who are genuinely friendly and hospitable and are not paid to be that way. Keep up the great work on this report! Que le via muy bien! Andale!