Your sound quality should be fine through the optical cable with the bitstream settings you described. Check the physical connections on your optical cable, to make sure it's seated properly in the PS3 and receiver. Also, double check the sampling rates you have set in the PS3 - I'm not familiar with your receiver but the sampling rates may be too high.
If neither of those work try a different optical cable. You may have a faulty one, and that's what I suspect is the problem.
Good luck.
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