Ok, it definitely sounds like the SMC profile is the problem, as this is more evidence that modems other than the SMC are shaping properly after PB.
Here's what I get while downloading video card drivers from AMD.
Edit: Attached another NM shot, but from an ISO download from Microsoft. I was surprised to see my latency in WoW increase from my usual ~31 ms to only 53 or so during the download. I was expecting it to be over 200. I don't have QoS enabled.