I use Water Wetter. Last 2 years or so. AIMSOIL has one called Dominator® Coolant Boost not sure on its specifics. In fact nigh time I did another flush on the system. May take a swing with the AIMSOIL product.
This is my first air cooled bike so I don't have any first hand experience with buells and the stuff but I used to run water wetter in my japanese bikes and they all responded well to it. Usually an 8-10 degree cooler running temp in the summers here. Vegas summers are brutal and my friends as well as myself all had good results running it in the past.