• Shifter is crisp and feels great in general, but is rather old and used, can by any chance that be the issue?

    If the indexing detents were worn, I wouldn't expect it to affect the upshifts at all, and probably not the downshifts either unless you short stroke it.

    You haven't said which cassette you're using. Is it in good condition? Is it of the kind where you might have accidentally slipped an 8-speed spacer into the stack instead of a 9-speed one in one or more positions?

  • Brand new SunRace 9 speed 11-36 casette, on an XT 737 hub and its stock freehub. Casette has no removable spacers anywhere, 7 largest cogs are mounted on a spider, 2 smallest are loose and have spacing on them, and they're installed right for sure, triple checked during the installation.
    Brand new chainring and chain too, so there's literally no worn parts basically right now (bar the shifter itself).

    Edit: went through the whole RD adjustment again with the help of a Park Tool vid, now all gears are borderline fine, but the performance is just not there.
    At this point I'm just gonna believe there's a minor bend in the hanger and fuck all. Also, I guess the cheapest possible casette, chain and chainring combo paired up with a mediocre shifter and RD just aren't capable of my high standards of shifting, I'm stubbornly used to old 7 speed XT-level stuff...
    There's noise, especially on the 1st and the 9th gear, which I expected on from a cheap, almost ghetto level 1x conversion. Chainline couldn't really be better though.

    I'm gonna stop overthinking and overtinkering and proceed with riding now I guess.

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