I watch races on ORF1 (Austrian TV) just because they have no commercial brakes. As a plus side they have Alex Wurz as a commentator. As you all know he is working for Williams team. He said that looking at Ferrari the whole weekend that on flat surface we are very strong and quick, but on the parts of track that have a lot of uneven road surface (waves) we are slow. Don't think it is traction but rather a compromised setup setting.