Have you ever considered getting yourself a Genuine WIFI/Bluetooth Combo card? something like this
https://www.amazon.co.uk/dp/B00MBP25UK/?tag=tonymacx86-21
I have that card bought from that link.
In El Cap it worked OOB
But in Sierra it´s not working in my R4E.
Only Bluetooth is working
UPDATE
It is actually working.
I updated my system HD to a NVME Samsung SSD 950 PRO via PCIE adaptor
I had to change PCIE location for wifi as R4E is a little tricky when it comes to PCIE.
From Shilohh´s AsusX79Files.dmg
"The R4E’s 2nd and 3rd slots are considered “Slot 2a” and “Slot 2b” and cannot be used at the same time as they have identical addresses"
UPDATE 2
Changing PCIE location only seemed to help but it was very buggy.
Had to use Darkvoids clover patch
http://www.insanelymac.com/forum/topic/312759-fix-macos-sierra-dp1-bcm94532z-wifi/
And now it´s stable
Update 3
It turned out that it had nothing to do with either PCIE or Darkvoids clover patch.
It was a router problem that now is fixed.(conflicting network)
Very strange cause when running El Cap. on my two desktop hacks there was no such problem