if you want to use partitions, you want to list out all the partitions. most modern NVMe devices perform best with ~4 partitions, but ideally you want to ensure that the number of ‘devices’ does not exceed the number of CPU cores. how did you overprovision? are you sure your model of disk benefits from OP? a lot of disks dont. ideally you should test performance with ACT before/after overprovisioning to ensure you’re actually getting some gain.