Windows 10 monitor scaling blurry

Question

Circumstances

• Windows 10 Version 1709 x64
• One 4K (27") and one 2K (27") monitor
• Nvidia 1050 TI

Feel free to ask for more information, if you need them.

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The Problem

Everything works fine if I don't use the Scaling option of Windows 10 (Settings > System > Display > Scale and layout). However, if I don't use the scaling function, the content on the 4K monitor is very very small.

If I do use the scaling function as recommended (150% for the 4K monitor, 100% for the 2K one), it looks good in general. However, in some applications (Outlook, IntelliJ, ...) the content on the 2K monitor is veary blurry. While there might be a fix for the programs in specific (even though I wasn't able to do this), I'd like a general fix for this problem.

Furthermore, when I use the 4K monitor scaled by 150%, Windows doesn't seem to be quite able to measure the correct size. That means, if I'm at the top right corner of the 4K monitor, at which a maximized window is open, I don't click at the closing button, but slightly above it. This is not that much of a problem though, I could adapt to it.

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What I've tried

• I tried running the programs (I tested it with IntelliJ) with Override high DPI scaling behaviour set to System and System (Enhanced), while using the recommended Windows scaling options
  • The programs controls are as tiny as if I hadn't scaled the monitor at all
• I tried scaling both monitors by the same factor (125%)
  • The controls on the 2K monitor are terribly huge
  • The controls on the 2K monitor still look a little bit blurry, but not as much as before
• I tried this tool
  • The same effect as with scaling both monitors by the same factor
• I tried setting my 2K monitor as primary monitor
  • The contents on the 2K monitor are blurry
• I (obviously) tried logging out and restarting my computer for each option I tried
• I tried some specific solutions for IntelliJ (which didn't work), but I don't think they're relevant here