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If your plot is accurate, your prospects can only be described as "very bleak". I do not see anything that makes me optimistic that you're going to get a full set of local networks, no matter what you do.
The question then comes down to "what is the minimum needed to be called a success"?
The stations from Monterrey come from two locations. The two VHF stations you picked up (with a UHF antenna, even) are on the easternmost side of the valley. The rest of the network broadcasters are on the western side of the valley and you have a 1900' ASL peak dead in your signal path. Since the UHF stations are all modestly powered, their signals are insufficient to diffract over those terrain obstructions with enough signal power to make the trip to your lower elevation, estimated at around 800'.
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