Thule WingBar or "whistle" on the roof

For a long time I sat on Thule because one is offered there for the money and service and compatibility. So even with the WingBar, this is as usual super processed and also easy to install. However, by the promise of quietness, I am very disappointed, wind noise in the form of a whistle from about 70km / h are permanently available. The only remedy gives the supplied sealing strip which is inserted into the T-slot. In practice, however, this is then a huge effort, so takes some getting everything set to the distances of z. Ex. The ski box, then back to resolve and einzufriemeln the sealing tape. After this Masnahme the whistle is still very bearable and less often.