Sleep issues on Z170, Core i5, GTX 960

So I guess my newly configured "fully functional" Hackintosh isn't exactly fully functional after all.

I'm running High Sierra 10.13.6 on a Z170 board, Core i5-6600, and a GTX 960 with web driver.

Sleep works, but it's suuuuper slow. It takes probably 30 seconds to actually go to sleep and upon waking up, the display will be black (but active/lit) for a good minute or two before the login screen finally pops up.

I've tried disabling Power Nap and using various darkwake settings to no avail. Is there a fix to this or could it just be a quirk with my setup? If it makes a difference, I am using DisplayPort. I was reading that that might have something to do with it.

I suspected it may have been USBInjectAll.kext, but the issue remains even after properly mapping out my USB ports with Hackintool.