Have you verified that the osxwifi card matches the one they sell for the MacPro 3,1?
Mac Pro 2008 (3,1), 2007 (2,1), 2006 (1,1) – Apple Broadcom BCM94360CD – 802.11 a/b/g/n/ac with Bluetooth 4.0
My experience has been that the adapter cards can be problematic. I purchased 3 generic adapter cards that came with separate BCM94360CS2 wifi cards and could never get any of those to work. The problem that I had with those card combos was that cold boots would often cause failed boots in EFI with motherboard power LEDs lighting up. The cheapest thing to try would be move your BCM94360CD onto a version 3.0 adapter card.
Mini PCI-E Adapter for BCM94360CD/BCM94331CD Upgrade to Version 3.0
I went with the version 3.0 card because of cost and the fact that, when I emailed oxswifi a presales technical question, I never got a response. So I deduced that I would get zero tech support from them.
Note that the version 3.0 of that miniPCIe card has one of the two screw tabs on the top perforated. You'll want to break that one off in order to have proper access to the antenna jacks on the mounted BCM94360CD wifi card.
My guess is that the problem is how the usb through miniPCIe connector wiring is handled on these adapters. On PCs, they normally use a separate USB cable that plugs into a motherboard usb connector (which Macs don't have).
Also, check the BT section of the system report. It should have the following under ' Hardware, Features, and Settings:'...
Bluetooth Low Energy Supported: Yes
Handoff Supported: Yes
Instant Hot Spot Supported: Yes
Manufacturer: Broadcom
Transport: USB
Chipset: 20702B0
Firmware Version: v150 c9317
Bluetooth Power: On
Discoverable: Off
Connectable: Yes
Auto Seek Pointing: On
Remote wake: On
Vendor ID: 0x05AC
Product ID: 0x828D
Bluetooth Core Spec: 4.0 (0x6)
HCI Revision: 0x2465
LMP Version: 4.0 (0x6)
LMP Subversion: 0x4196
Device Type (Major): Computer
Device Type (Complete): Mac Desktop
Composite Class Of Device: 0x380104
Device Class (Major): 0x01
and under 'Incoming Serial Ports:'...
Bluetooth-Incoming-Port:
RFCOMM Channel: 3
Requires Authentication: No
Device Class (Minor): 0x01
Service Class: 0x1C0
Auto Seek Keyboard: On