Unfortunately, since reinstalling W10 I haven't been able to use my DK2 at all

Spent far too long trying solutions it's now just stuffed in a box.
I had no luck with SDK 0.6 on Windows 10 64bit. SDK 0.5 worked.
If you're not going to use the DK2 at all, I suggest selling it on E-bay. Ever since Oculus stopped production, developers have been buying them for a premium (currently ~$500). Use that to buy the CV1 when it comes out.
As to my experience, I get slight judder on the surface with a GeForce 970. I use to, and still get worse judder inside a Coriolis station. It's not too bad, as long as I don't go swinging my head around widely. I turned down the shadows, and have most everything else set to about "medium."
This is using SDK 0.5. I tried SDK 0.8 with SteamVR, but couldn't get my monitor to the prerequisite 75hz, so it was terrible. A combination of a little judder and a lot of blur (looked interlaced).