Dual (Independent Mode) Thunderbolt Drive (5K iMac) - Second drive not showing in Windows but shows in OSX

Hello everyone,
I have a (2014) 5K iMac.
I'm running an "OWC Mercury Elite Pro Dual" hard drive running two drives running in Independent mode.
This enclosure has 1x USB3 and 2x Thunderbolt ports (one extra for daisy-chaining).
I have two 6TB drives in this enclosure which run perfectly in OSX under thunderbolt.
In bootcamp the two drives only work with the USB connection when using thunderbolt ONLY the first drive is shown.
I need to use Thunderbolt because all my USB ports are already used.
I am running Windows 8.1 installed using Bootcamp Assistant.
I have had this problem since getting my iMac at launch but now I'm already using too many USB ports including some HUBS.
I have done many web searches, I cannot seem to find someone else with the same problem. I have also noticed the new 5K iMac fixed many of the older problems of Thunderbolt with Bootcamp.
Hopefully there is something I can do to resolve this?
Thank you for your time.

While the enclosure supports daisy-chaining, I'm not using that feature.
The enclosure with two drives inside is connected directly to my mac using the supplied thunderbolt cable.
I'd also like to ask if anyone uses an enclosure that supports 2 or more drives with thunderbolt on a Mac using Windows 8?
If it works for anyone and they can see all the drives that would mean the issue relies with me or my configuration rather than the entire mac ecosystem.
I have a feeling I had seen someone else with my problem in my earlier Google searches 6 months ago. But now I cannot find anything, not sure if I'm using the correct search terms or it was a false memory on my part.
Anyways, thank you for your response

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