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I haven't tried the b-screw - one of those things that terrifies me for no reason
Screw it in and watch the RD move backwards, away from the cassette. It's pretty self-explanatory.
You need the RD to clear the teeth. If the B-screw isn't in far enough, the jockey wheel teeth will clash with the cassette teeth. I normally aim for 1mm gap between teeth on the road (sometimes more if I'm running a silly cassette and need to take up slack when chain is on the 11T).
SRAM has some funky tool to set it.
@pifko I haven't tried the b-screw - one of those things that terrifies me for no reason - but sounds like I need to be brave.
@coventry_eagle cool, I'll try that. I was a bit perplexed by thinking I might need a long cage RD for a 11-32t cassette.