Your 3512 is at least showing the right stuff, but it may have a bad flash anyhow. Like I said, they seem to work for some folks and not for others.
From what I've read, some of the SIL cards that have odd memory chips can still be force-flashed. But given the problems you're having I'd suggest going for one that's known to work. The SYBA card has the right memory. Mine is running HDD and optical side-by-side and smooth as silk.