Could you take the Skidoo clutch tool and screw it in to separate the driven clutch, and see if the nylon glides are in fact intact? At a certain point, the driven clutch actually spreads apart while the drive clutch will tighten up.
As the noise is at a certain rpm range, I am wondering if it is the glides or "ramps" on the driven clutch that have a wear point, which could be because the nylon pieces are cracked, missing, or worn.
once apart, try wiggling the plates side to side. It could also be the bushing is broken or worn, which would be the wiggle in the inner and outer plates.
Drewski
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