Bearing preload could be off? See https://www.stradawheels.co.uk/info/how-to-adjust-chris-king-r45-hub-preloaders/
Thanks, did try this at a spectrum of different tensions within reason, and it helped a tiny bit when loosening it (but with more slop than i can live with) but the noise started again shortly after.
@t0-ster started
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Bearing preload could be off? See https://www.stradawheels.co.uk/info/how-to-adjust-chris-king-r45-hub-preloaders/