I'd track down Bense via this link which is this:
Bense, as you will see, has done things with the xw8600 that no one else has. If anyone can help you on this issue it likely will be him. It sounds like you may have found a firmware updater for an on-PCIe LSI card, and applied it to your on-motherboard LSI chipset.
I think he may have finished up his xw8600 work, and it is frustrating that his great pictures are no longer part of his posts but he is a very helpful guy and has some contact threads you'll find in there.
Give him my best.......
Scott