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@Sparky
Ok, epiphany hits. When I pull the mech outwards to tighten the cable it runs freely down into the frame, but when it shifts inboard the cable gets bumped into that spring, so has to bend a corner. Basically, as the cable tightens when you shift, it's route is route is changed as it is forced to run up to, around and past that spring - it's self-cancelling. The mech is almost pulling the cable from one end and the shifter from the other. I'm having to use a band-on adapter - would getting a band-on mech fix this, and stop the cable run being interfered with? In an ideal world I'd like one with some sort of in-line adjustment, too, as I don't have any.
Does that make any sense? Might be time for a diagram!