I'm sorry to have to break this to you but the reason that your problem was solved with a new master cylinder is because the clutch fluid got changed along with it. The clue is that the problem is temperature-related and first occurs when the engine gets hot. The fluid had water in it and would boil down near the slave cylinder, producing a pocket of steam that produces the same clutch-dragging behavior that air in the line does.
http://ducatisportingclub.com/xmb/vi....php?tid=11024
Shazaam!
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