Depending on your line of site/horizon view there is also I-905 (24.5W) ORTM-Mali (4111L 5750) & RTB-Burkina Faso (4193R 5179) that I can receive with a circular lnb. If you have a bigger dish (10-12ft) you might be able to get I-907 (27.5W) NTA-Nigeria, etc which I cannot get on my 6 ft dish.
However it is much easier to get some of these channels (OTRM, RTS1-Senegal, and others) on Ku, with a C-ku lnb combo, if you don't have line of site and could get Galaxy19 (97W), even though you specified C band only.