DrivePool's footprint ranged from 2-5GB before I added all of the pool's drives to NOD32 anti virus's exclude list. At least I'm pretty sure that's what fixed it.
Attached is a poolmon screenshot showing a few pools owned by covefs.sys (I think...please correct me if I'm wrong) at or near the top of the list, totaling over 4GB.
I wish I didn't have to disable antivirus for those drives, so would love any information from the developers about the cause of this problem or any other way I can mitigate it.