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#1 - Instead of using the Adaptive Lens filter to merge the component images, use either PS's photomerge tool, or any of the 3rd party panorama tools.  In my experience, it's best to use the Adaptive Lens filter only to make relatively small touch up level corrections to either single images, or merged panoramas.

#2 - Keep the camera absolutely level (ie, to within, say, 1/2 degree) as you rotate, ie, put the camera on a tripod, and level it up precisely before taking the component shots.  You might occasionally be able to do it by hand, or with the tripod not level, but it will be a hit or miss proposition, and if you miss, the result will look like your example image. 

Tom M