Slipper clutch - I'd be more inclined to suggest this is the cause of your noise. If the pads are worn/glazed up then your clutch is not working correctly. Replace the pads of clean them up then set as per the manual about 3 full turns in from flush (Only guessing).
The BFast diff kit you refer to is it the SX10 one? The reason I ask is the brass shims are very important for the diff to work correctly.
Next diff tightness. You should tighten it to full (spring bottoms out) in your hand then back it off 1/8 to 1/4 of a turn. NOTE - You must break the diff in as per the bfast instructions first.
Good luck hope some of this info helps you sort it out.
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