Indexing woes: if I get it shifting down ok, then it won't shift up and vice versa.
Bent hanger?
Could be. Is it worse at one end of the cassette than the other?
Shitty crap in your cables? Shitty knackered chain and cassette? My Ribble was like this so I gave up and bought a new bike*.
*With disc brakes and other things the Ribble didn't have.
Could be a weak return spring on the derailleur, had this on a new ultegra derailleur took me a very long time to figure it out. After new hanger, cables etc etc.
Frayed cable inside the shifter?
@Scilly.Suffolk started
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Indexing woes: if I get it shifting down ok, then it won't shift up and vice versa.
Bent hanger?