Try setting up on your true south sat.,which at 117.2 would be closer to satmex 5.Try small adjustments to the elevation and move the whole thing on the pole left and right.The elevation listed for your location may be off by 5 degrees up or down on your type of dish.It takes patience,but if you find your true south sat.,then lift up or push down to see if the signal improves or gets worse and tweak it in good,then you should be able to find and tweek in the other sats.Maybe someone will chime in here and give you some more info.Hope you get it going.
