I went though this battle when I had my Ultra and after spending a bunch of money on windshields ( I settled with a Klockwerks by the way) I learned that the wind from around the gas tank was the culprit. I bought a set of JES lowers and all my issues went away. I no longer own the Ultra but still have the lowers if you are anywhere near Chicago I would be happy to let you try em. I took them off before selling and they are just sitting on my shelf. Thought about selling em but to long to fit in a USPS box and don't feel like finding a box