The hood on mine is really snug. I didn't realize it was a two stage hood myself until I saw a photo of another camera with the hood all the way out.
My KO is the Rapid M (with interchangeable film magazines). I believe it's an earlier model to your 100. They are wonderful cameras.
I originally didn't want to get the 180mm as I usually don't like anything longer than a "normal" lens on a rangefinder. I came across one at a really good price, bought it on a whim, and was surprised at how much I liked it. It's only drawback is that you can't focus any closer than about 12' with it.