There is just one version of the Endurance test that is publicly available and we are all using it.
There is nothing special with the 46% or any of the other compression levels, it's just a write pattern that results in a that particular compression ratio.

It does sound weird that several 512GB are failing, they should behave just like any other m4 drive.

Just for the record, what settings are you using, static file size, min free space etc.