I read everything and yes unfortunately there is no option between 100 -200 for the UI scaling.
Here the correct place where you can place this feature request : http://feedback.photoshop.com/photoshop_family
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You would need to use Windows scaling of you display I posted a comparison some time ago between Windows scaling and Adobe 2x UI. For Adobe Scale devices like the Surface Pro 2 and Surface Pro 3 Display 2x. These displays do not meat Photoshop UI requirements when scaled 2X. Photoshop requirement state at least 1024x768 pixels requires. The Surface Pro 2 display 1920x1080 becomes a 960x540 display and the surface pro 3 display 2160x1440 becomes a 1080x720 display. CC 2015 scripting does not even respect users Photoshop UI preference setting an will scale dialog on those machine end when you set scale 100% not 200%. To use Windows Scaling you need to update the windows Registry and add External Manifest Files for Adobe Products.
Adobe Photoshop UI scaling will use High resolution in the image window....
You are Welcome and thanks for that