nubo,
I settled on an 8" Stealth "Hunter" for my Patriot Dually, balanced nice with just a slow forward roll, and sucked up any remaining vibration and made the bow much quieter.
It worked perfectly, and actually the design of the Stealth with its dual chambers compliments a dual cam bow perfectly. The doinker/SIMS 'Motion" style stabilizers seem to work better with the uneven more vertical thrust of a single cam bow. The Dual cam bows have a more even forward thrust because both ends of the bow fire equally. The Stealths work exceptionally on all styles of bows but they will by design work even better on a dual or hybrid cam bow.