Swarovski 65 mm STS HD Straight Spotting Scope

I have been shopping for an excellent quality birding spotting scope for some time. I wanted a smaller scope for travel (instead of the 75-85mm). I got a good deal on a new Zeiss Diascope w/15 -45 x eyepiece. I was disappointed in the Zeiss because it had an area that was out-of-focus along the outside of the circle. I talked with both the Zeiss techs as well as the Zeiss birding authority who both told me that was the way they are designed and the blurry area would disappear at higher powers. Well, it didn't, so I sold the scope.
I had looked through a number of Swarovski scopes over the years and was always impressed with their edge to edge crisp focus and overall quality. I really like the scope except for a couple things. First, I wish the eyepiece had a wider angle of view for scanning. And, the focus knob on my scope seems to be too easy to turn. I don't know if all Swarovski's are like this, or if mine is looser than others. It's okay now (in cold weather) but I am concerned that it will loosen up too much when it is hot and humid.