After the YAW crashes and all the great tips I got from you I had to test and fly a lot to get confidence back. After mounting the naze32 properly (instead of doubleside tape) and after removing the side covering (like Aeroguard) the Issue dissapeared. Oh yes, I also taped the Baro but I think it isnt used...
!!!Thanks again for your help!!!
Since this day was windy but the place was so great to fly at, I got comfortable flying there I did some tricks. Over and under the trees is so bird-like - great relaxing sport!
And at the end you get a special landing ;-)
Give me hints if you've seen others doing compareable "landings".