1. Did you disassemble down to every last nut, bolt and individual component? If it can be further disassembled, do it.
2. Poked out all lateral bleed holes in carb-venturi, emulsion-tubes, pilot-jets?
3. scrubbed out all secret hidden passages with PEA-based fuel-system cleaner with brushes?
http://n4mwd.blogspot.com/2013/10/se...-passages.html
4. ultrasonic soak, micro soda-blast everything?
5. replaced all rubbers: fuel-rail O-rings, float valves, mixture-screw O-rings, float-bowl seals?
6. set float-height with final wet-test to verify?
7. sync carbs after installation?
Do search on here for "clean carbs ducatiman" for threads with how-tos and photos.