Indeed it is the same as mine.
Did you try to reinstall the Sonnet fix with
just installing the IOPCIdriver.
Failing that I would use Carbon Copy cloner
to clone my drive then use Multibeast to install
relevant Express Card driver to the cloned drive. Boot from
cloned drive and do all your testing with the cloned partition.
When you get it working (positivity) repeat the process on
your main drive. I have some experience with Multibeast as I
have a Customac but I don't know for sure if this will work. I'm
on iPhone at moment but when I'm back at my laptop
I will check the driver options in Multibeast.