I can't address the Wunderlich add-on spoiler but for reference I run a F850GS windscreen with a Puig clip-on deflector, it is a little smaller than the Wunderlich unit. I would expect the the Vario-Ergo 3D would work well, I'm very happy with my Puig Clip-On, it works for me but I'm 5'8", your mileage my vary. The clip-on deflector makes a big difference as far a buffeting goes. On a related topic, Winglets are also a nice ungrade, I'm using Madstad winglets and they make a huge difference it quieting the turbulence in the cockpit. Madstads work well on US bikes but European bikes generally have LED turn signals and the Madstad winglets don't fit. It is my understanding that the Puig winglets are a better choice for bikes with LED turn signals. Too much information, I got off track a little. Hope this helps. Cheers.