One problem was set-up was too rich with too much fuel at idle. Then you make it worse by adding even more fuel.
The reason original owner added so much fuel was because carbs are clogged. Newbies always think more fuel is solution, and it may work temporarily. But clogged carbs gets worse and worse. It may idle, but won’t rev, or vice versa.
Real solution is not to add more fuel, but to clean carbs and restore to factory-fresh condition with all factory jetting. Bike ran perfectly fine from factory, so no reason it won’t if carbs are refurbed back to factory-fresh condition as it left dealer floor. Search for “clean carbs ducatiman” for numerous other cases like yours.
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