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b adjust screw wound as far as it will go and the jockey wheel is still catching any possible solutions ta
mtfu and get a 32 😉
longer b tension screw.
what frame is it ?
Check the chain length.
Untighten the bolt that attaches the mech to the mech hanger & see if it moves away from the cassette slightly.
Is it a medium or short cage rear mech? You often need a long cage mech for wider range cassettes.
Had a problem like this with an X4 mech. The b screw bears directly on the back of the hanger and a minor off can cause the screw to find a new 'home' in the soft alloy of the hanger making it difficult to put any tension on the b screw.
Not a problem with more expensive mechs they have a steel tab to protect the hanger.
