Only thing I can think of is that the 9sp chain is too wide, but 6.6 to 5.8(?) doesn't sound like enough of a difference
Chainrings look close together, should there be (or could you add) shims between the inner ring and the spider?
None of the images or documentation suggest there should be, but I'm considering it
@gbj_tester started
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Only thing I can think of is that the 9sp chain is too wide, but 6.6 to 5.8(?) doesn't sound like enough of a difference