Since no one has replied, I will UPDATE in a reply to my former post.
I have done the injection from scratch with no change in results. Wifi+BT work great in OS X 10.9.2, but Windows 7 SP1 will not find any networks nor devices, despite both working flawlessly prior to OS X injection.
This time around I have even performed the 5Ghz patch, which, I will add, greatly improved BT mouse performance when Wifi was under load (prior to the patch, interference on the 2.4Ghz channel caused the BT mouse to lag greatly). However, as I had suspected, this did not alter Windows 7's ability to see networks or devices (despite seeing both the current drivers for the card in Device Manager).
As this is my first build, am I simply missing something when it comes to dual-booting OS X and Windows, or is this particular issue limited to the use of a mini card such as this? In my searches on the forum, the only other post I've seen that has reported a similar issue is
this, however there seems to be no solution on that thread nor the tomshardware thread linked within.
I would be grateful if anyone could at least set me in the right direction to resolving this issue.
Thanks again.