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I take your point about " thinking out loud " but just one more point , if you mic up your piston to check the dimension of the skirt, do bear in mind ( assuming you don't already know this ) that a brand new piston is not a uniform size when it is cold, it is slightly smaller in the piston ring area. The widest part of a new piston is at the bottom of the skirt at 90 degrees from the gudgeon pin holes, this could mislead your line of thought if you measure it. The theory of this is that there is more metal in the ring area than in the skirt , hence more expansion when hot.
I have owned and restored 12 Ducatis , most of them carb models, only one of those suffered from piston slap, that was a 600SS with 25K miles on it, a new piston cured it. So " they all do it" is a myth used by people who are in the process of selling their bikes.
Let us know how you get on with that.
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