Sounds like your carburetors need some work, contact @
ducatiman he's close by on Long Island for your carburetor needs, and other issues.
Add valve adjustment to your list of things to do, odds are it's never been done.
Personally I recommend Shell Rotella synthetic oil. As the bike uses a wet clutch, if you use the wrong oil, it leads the the clutch slipping.
As with any used bike, you should go thru everything, especially the brakes.
As or course my standard greeting