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4k multi display oddities

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Joined
Sep 19, 2013
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Motherboard
Gigabyte GA-Z87X-UD5 TH
CPU
i7-4790k
Graphics
GTX 1080 Ti
Mac
  1. MacBook Air
Classic Mac
  1. eMac
  2. Performa
  3. Power Mac
  4. PowerBook
Mobile Phone
  1. iOS
Hi guys,

I'm having a bit of trouble with my new 4K setup. Computer specs are as follows:
4790k
1080ti
32gb RAM
Z87X UD5 TH mobo
macOS 10.12.5

If I start up with just the 4K monitor (a 32" BenQ) connected via Displayport 1.2, it's fine. If I connect with that and two monitors connected via HDMI it's fine (I've been leaving an Oculus rift and a BenQ projector plugged in). If I add a 1440p Dell display connected via Displayport, it starts up with a black screen, that I can sometimes fix via turning the BenQ 4K display off and on again, sometimes not. Sometimes removing the 4K monitor's displayport cable and reattaching it fixes it, sometimes not.

Oh and I should mention my nVidia web drivers are 378.05.05.15f01. Windows 8.1 works fine with this setup.

What's going on here?
 
Thanks for moving it to the proper forum mods. Any ideas, folks? :)
 
Here's my EFI, hopefully that can help shed some light on this issue.
 

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