the reason 11720 is low is because right next door is 11724 V on Dish 121 which is overpowering it. If you had a dish like the cable companies use (15 feet or larger) you wouldn't notice a difference. But because we have smaller dishes, the Dish121 signal interferes with G10.
We had a couple weeks when it was BOOMING and that was because Dish had turned off the 11724 TP
and yes Dish has a TP on 11800 too but its opposite polarity so there's no issues. Over at satelliteguys, we had Gary (the guy who hosts that crazy "unreliable sources" late Friday night) explain that the power they put out on both TP's was the same and it was the cross pole of our dishes.
In lehmans terms, need a bigger dish
I went to a 90cm Fortec and get 40-48 on that TP on my Pansat 1500. 11800 is at 75 or so