The skew is extremely important in the case of a dish used for satellite internet, as you are also transmitting; and only a watt, not hundreds of watts.
It is possible that 90 is the correct skew for your area depending on where you are and which bird you are hitting, but very unlikely unless you live on the far edge of the coverage area and still it would not be that extreme.
I assume you are trying to hit Echostar XVII, which is located at 107.1°W longitude.
So for Missouri, I am thinking somewhere around a 20° right hand skew.
Adjusting the skew is just as important as adjusting the azimuth and elevation. It will make that much of a difference in the signal strength. The skew should be adjusted first to the correct position before any other adjustment is made. The pole should be plumb on all sides so that all the numbers will be true on the dish when adjusting for signal.
The documentation I read indicates that the DishNET Jupiter birds use circular polarity (the feed horn is marked with an L and a R and you have to align an arrow with the appropriate polarity). The Spaceways would appear to use linear polarity as they speak to setting the skew. Also according to the document, DishNET additionally employs ViaSat constellations that use linear (Surfbeam 1) and circular (Surfbeam 2) polarities.
You need to know specifically which one of the configurations that you're pointing at (though the Surfbeam 2 constellation horns apparently don't need to be configured for polarity or skew).
There's even more to tuning than adjusting the dish. The modem has to be used as part of that process.
Upload the latest cfg file, reinstall and submit parameters. The dish is now ready to point. Not loading the cfg file will get you a signal no higher than 29.