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It sounds like a line of sight issue, but you say you are sure there is no obstructions?
The angles all look good!
Radley, KS 66762
Latitude 37° 24.792'N Longitude 94° 42.138'W
Sat Name Sat Lng Az(t) Az(m) El Skew
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Nimiq 2 82.0W 159.6 156.1 44.6 -16.0
Brasilsat B3 84.0W 162.7 159.2 45.2 -13.6
XM Roll 85.0W 164.3 160.7 45.4 -12.4
AMC 9 85.0W 164.3 160.7 45.4 -12.4
AMC 3 87.0W 167.5 163.9 45.9 -9.9
Galaxy 9 91.0W 173.9 170.4 46.4 -4.8
Galaxy 11 91.0W 173.9 170.4 46.4 -4.8
Nimiq 1 91.0W 173.9 170.4 46.4 -4.8
Brasilsat B4 92.0W 175.6 172.0 46.5 -3.5
Telstar 6 93.0W 177.2 173.6 46.6 -2.2
Galaxy 8I (incl. 1.0 deg) 95.0W 180.5 176.9 46.6 0.4
Galaxy 3C 95.0W 180.5 176.9 46.6 0.4
Telstar 5 97.0W 183.8 180.2 46.6 3.0
Inmarsat 2 f2 (incl. 1.7 deg) 98.0W 185.4 181.9 46.5 4.3
Galaxy 4R 99.0W 187.1 183.5 46.4 5.6
DirecTV 2 100.8W 190.0 186.4 46.1 7.9
DirecTV 1R 100.8W 190.0 186.4 46.1 7.9
AMC 4 101.0W 190.3 186.7 46.1 8.2
DirecTV 1 101.0W 190.3 186.7 46.1 8.2
AMSC 1 101.1W 190.5 186.9 46.1 8.3
DirecTV 4S 101.2W 190.6 187.1 46.1 8.4
AMC 1 103.0W 193.5 189.9 45.8 10.7
Solidaridad 1 (incl. 2.8 deg) 103.5W 194.3 190.7 45.6 11.3
AMC 2 105.0W 196.6 193.1 45.3 13.2
G-Star 3 (incl. 11.5 deg) 105.0W 196.6 193.1 45.3 13.2
G-Star 1 (incl. 6.0 deg) 105.0W 196.6 193.1 45.3 \
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It may be the dish/LNB. You may have different types and would have to enter different L.O. values.
Standard 10750
Universal 09750-10600