I have AMD with TI firewire chipset, and adjusted BIOS as you have described but this unfortunately made no changes fixing the cycling sample rate.

I can run other devices from this card with no issues, so maybe the 10-bit Tag was not the problem here.

Forcing the sample rate with a Steinberg App, has worked, but not rock solid as other Non-ASIO apps can trigger the cycling again.

I am now using an external clock via SPDIF to lock the H8000FW sample rate.