The true answer is to see a tailor. Much like buttoning point, sleeve pitch, shoulder balance, etc, the only way to achieve the proper proportions and fit is to consult a tailor.
I will warn, the realization that such details are highly subjective and rarely correct off the rack leads to much more expensive thoughts...
I have a tailor that make all the alterations to my suits or jackets. Thing is, he says lenght look fine. I don't know how trusty are tailors in Mexico City.
Thanks! I was checking that thread a moment ago.