First make sure your chain length is right.

Then dont overlook the much misunderstood "B" screw adjustment. It is NOT a tension screw, it is adjusted for clearance between the jockey wheel and the largest sprocket on the cassette. The spec on my Sram 7 for instance is 6mm. The best way to measure that clearance is with the end of a 6mm allen wrench.

THEN do all the adjustments in order described above.