Retry 10.13.6 then and make sure nothing gets added to your Extensions folder to break anything...? I don't know. My guess was USB-C requires specific hardware options too to enable the USB-C HDMI output...and the laptop may not have it or the driver may not support it... I have another device that would be really nice if it supported USB-C HDMI...but it lacks the physical hardware chips to do it. So I know not all USB-C devices can do it.
I didn't install anything, I just booted into windows and started using Wifi... No prompts to install drivers, it was working on first boot. See attachments for screenshots of what drivers it was using.
Can you provide details on exactly how you got USB-C to HDMI working? And the 2.8Ghz fix?
What do you mean about detect others nearby? in Windows I used if for some basic internet usage for a few hours, no noticeable issues. But mainly windows is for a single game, otherwise 99% of my time is in OSX, and that seems to be stable and solid so far. I don't have handoff or continuity configured in OSX as I still haven't gotten to doing the iMessage stuff.
Just another note, I did another hackintosh with another Alienware R4, 7700HQ, intel 630, GTX1070, and swapped in Dell DW1560. Everything works...sound, wifi, bluetooth, sleep, USB, etc. Same as my prior build. Had to use an alternate kext from the v10 Clover download from RockJesus was all...but I did on my prior build too. Very happy with it.