Sorry if this has already been mentioned, but...
Can I ask why the ADATA S510 was the only one run without the "All 0x00, 0Fill" test data?
My understanding is that if the drive uses compression (and I'm guessing most/all the SandForce ones do?) then using all 1s or all 0s will compress a lot better than random data. So while this setting does seem to favor drives that use compression, it also seems unrealistic. But it would explain why the S510 scores so much lower as the data being used is more realistic.