Hey again,
As I am in the same situation as you, I have been following this thread and other conversations regarding the VRS-8 and Hackintosh systems.
Unfortunately, my investigation would suggest that our issues have nothing to do with which thunderbolt card we are using or how it is set up, but rather that the VRS-8's drivers or firmware simply do not allow it to be properly initialized by a Hackintosh system.
I can get a single VRS-8 interface to initialize and function in Windows 10 via Thunderbolt (Alpine Ridge 2.0 card -> Startech TB3>2 converter -> Apple Thunderbolt 2 cable -> VRS8), even though Windows thunderbolt connectivity is not yet supported.
In OS X (10.12.6):
-Connecting via Thunderbolt does show "No Drivers are Loaded" instead of "No Hardware" in System Report
-IOReg seems to show some level of thunderbolt connection, but does not actually recognize the unit.
-Connecting via the PCIe card also yields no connection in OSX but does work in Windows 10.
Also of note:
-While booting to windows, the interface clicks twice, flashes the lights back and forth in sequence right-to-left and left-to-right, and then clicks once more as Windows is booting.
-While booting into OS X, the interface clicks twice, flashes the lights back and forth in sequence right-to-left and left-to-right, but does not click the 3rd time.
It would appear that the VRS-8 itself is simply failing to initialize as OS X is starting up, and therefore is not available as an audio device. It is very likely that thunderbolt is working properly on our systems already, but the interface is the issue (I am going to have to pick up some alternate thunderbolt peripheral to use for testing, but this still seems like the likely scenario).
This is also corroborated by some discussion in the Slate Audiophiles Facebook group which has documented UAD Apollo, Lynx, Focusrite, and other interfaces (as well as various other thunderbolt peripherals) working across multiple Hackintosh builds, but the VRS-8 will not work/initialize on those same systems.
The VRS-8 will also not work via PCIe on those systems.
Slate's support staff (as well as Steven Slate himself) are aware of this, however, Steven Slate's response to the FB discussion was "Unfortunately guys we cannot create a driver for a hackintosh and will continue to focus on Mac Thunderbolt and PC PCIe". Not exactly what we want to hear, but also completely understandable since no developer is going to specifically develop for configurations that aren't "supposed to work".
That being said, this doesn't necessarily mean that the units will never function using Hackintosh systems (competing interfaces working properly would suggest that something could be done to remedy the problem), but it does mean that it won't specifically be a priority to add support for hacked systems.
Also, it sounds like PCIe behaviour on old MacPro systems has exhibited similar non-initialization issues.
This could be promising since it is possible/likely that whatever required alterations to the drivers and firmware are made in the interest of correcting that functionality may have the side effect of fixing Hackintosh initialization as well.
In the mean time, it might be of more use to simply verify that thunderbolt is working on your system with other devices. Beyond that, it may simply be a game of waiting and hoping that we can eventually use our interfaces with OSX instead of just Windows.