What are your signal strength readings for 103s transponders 16 and 20, and all listed transponders for 103ca and 103cb?
I did a little checking with the info on this site and Google Maps. Valentine is 224 miles from the center of Sioux Falls spot beam (as the crow flies) That's pretty far but based on the beam footprint map if your dish was aimed perfectly I think you should be able to pick them up. They'd be pretty weak and therefore very susceptible to weather, so even heavy cloud cover could cause them to go out, but you'd still have the LA locals as a backup.
As for how to get them on your account if you can get them, that's another issue, but first things first let's see if you can get anything on those two transponders. And if not whether your 103ca and 103cb readings show any room for improvement through more precise aiming of your dish.
Signal strength on 103s, #16-69.#19-69,#20-70,#22-86 #23-90, 103ca (1-8) NA, (9-16) are 83,89,83,86,82,97,83,87. (17-24) 82,87,85,86,82,86,83,84, (25-32) NA 103cb (1-8) 76,83,77,82,74,81,78,82 (9-16) 76,82,77,63,76,83. Na,na,(17-24) NA, (25-32)NA