Main 4K Display scaled to 125%, others @ 100% look weird

[dsc106]

Windows 10, multi monitor setup with a 4K monitor, 1440p monitor, and 2x 1920x1200 monitors.

I have the main 4K display scaled to 125% so it's not so tiny, looks good, however the other monitors even though set to 100% (recommended) have odd looking text - look grainier or lower quality. Any possible relation?

Also, could cable length be a factor? For my standing desk I have the side monitors wired on 15-foot displayport cables.

 

[Mr Evil]

Windows renders everything at the primary monitor's scale, then scales down for the other monitors. This results in bluriness, which isn't ideal, but at least most apps end up at the correct scale.

 

[dsc106]

SHiiizzle. WHY oh why. The world still isn't quite 4K ready yet, eh?

It definitely makes my 1440p and 1200p monitors look funky and cheap on text. Even in MS products like Excel. Bummer :/