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maybe i'll reset the limit screws and set everything up from scratch tomorrow.
I'm sure you know, but the limit screws only determine how far the derailleur can move outward maximally at both ends of the cassette; it doesn't have any effect on shifting up and down the cassette. So I won't get my hopes up that resetting them will improve anything.
What about the cables? Are they used? Consider getting new ones. My bike shifted like crap, and I was worried the shifter was toast. Turned out the cables were totally corroded.
OK so quick update, i bought a half price mech alignment tool and tweaked the mech hanger quickly this afternoon.
It's lots better, it now shifts well upto the extremities of the block with the right number of clicks.
it seems quite sensitive to cable tension and i can get it to shift well up the block but not down or vice versa if i adjust the cable tension, maybe i'll reset the limit screws and set everything up from scratch tomorrow.