We are with you, I think the whole purpose of this forum thread is to feel a sense of companionship in what is a long, complicated and irregular journey.
As you might have seen, once the application moves out to the Visa office after it passes the sponsorship process, its treated completely on the timeline of the visa office. It doesnt matter if its received in April, May or June. So keep looking for folks in Mexico office and see how applications are moving in that office.
Now across offices, I see there is some movement as our batch of applications are well past the standard time, so I hope once they get hold of the application they will clear the files soon.