StableBit DrivePool doesn't have a master and subordinate/duplicate copy. Both are equally viable, and treated as such. This is very different from how Drive Bender handles things.5
As for being documented, not really, but sort of. Eg: https://wiki.covecube.com/StableBit_DrivePool_Knowledge_base#How_To.27s
That said, if the data is in the same relative path under the PoolPart folders, they're considered duplicates. Changing the duplication settings, or even remeasuring can kick off a duplication pass that will automatically prune the duplicates, as needed.
Also, the "dpcmd" utility has an option to disable duplication for the entire pool, recursively. However, that kicks off a duplication pass that actually manages the files.
Just have both products installed. That's it. You can fine tune settings in StableBit DrivePool, in the balancing settings, as the "StableBit Scanner" balancer is one of the 5 preinstalled balancer plugins.
That should be fixed now. Though, the file system scan won't trigger the drive evacuation. And yeah, that fix was shipping in the 2.5.5 version, and the latest stable release is 2.5.6, so this definitely shouldn't be an issue anymore. (we haven't seen it in a while).