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@rhb
why mess with the L&H screws? These limit the movement of the rear mech to stop overshifting at either end, or undershifting i.e. not picking up 1 or 8 in the example given...
Sounds like an issue with cable tension, possibly rust in the cable housing stopping the cable operating proper. I'd recable the whole thing and re-index from there to get the cable tension spot on.