11760 is one of the strongest transponders on 103w KU. The SNR is 12.0dB for 11760 and a weaker 9.4dB for 11880. Not sure what your reported SNR readings are? RF level?
Something caught my eye that could possibly cause a problem. If the skew is not correctly set there are both horizontal and vertical polarity transponders on this frequency. The only difference between the carriers is that the Vertical MUX is CCM with a FEC of 5/6 and the Horizontal MUX is ACM with a FEC of 3/5. It is possible that a receiver could have problems logging this type of co-located carriers transmitted on opposing polarities.
Here is a plot showing both horizontal and vertical downlink polarities on 103w KU. Definately a strong and fat transponder!