Works in mounting positions not under strong winds

I have the FlowStar now pretty much a year and am very disappointed. The main problem: I live on the 7th floor of a high building in the north - when things are blowing here, what it does quite häuftig, then the FlowStar is completely overwhelmed. Since he is "only" held by a spring and a few magnets, he can oppose the vacuum average gust of wind from the wrong direction and is not sucked out. For me even catapulted, which certainly means that the cheap plastic slide gives up the ghost in the foreseeable future. That being said, there is a Höllenrabatz in the kitchen.

Of course, the installation instructions have been meticulously observed and checked again (No building foam, no inclination, etc.). The low setting with the +/- wheel bring no solution. I even stuck a self-carved "wreath" of a plastic Blumenttopfuntersetzer to the FlowStar to winds dissipate a bit more: does not help the problem are actually less grip the air flows under the cap, but the resulting negative pressure in a gust of wind ,

But what particularly annoys me is the lack of support by the manufacturer. This hides behind its dealer network. To my support requests via email I did not even receive a response. From a German manufacturer I expected a lot more. I could not even find the installation instructions on the website for download today, which I find almost embarrassing.