Here's a question I didn't think of: Were you friction-shifting 8-speed before? I've been fine with 9-speed after getting used to it, but 8 is definitely more forgiving of having the pulleys slightly off center without catching an adjacent cog. These modern (by Rivvy standards) 9-speed cassettes are built with all kinds of jagged shapes to facilitate an index shifter popping that chain to the next cog for some masher who doesn't know anything about lifting for shifts. 9-speed is certainly workable with friction, but it takes practice and a deft hand to nail it.
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