Wow, you actually are a real wizard aren't you? I looked up that .iw7 files are related to the Tarma Installmate application, but I was still unsuccesfull in opening them.
Thanks for your help aswell, I think 1.80 could be right, my aim is atleast a bit better now and it also seems that your sens is tied to your fps so made sure my fps is stable. Proof: screenshot of a good game