>>390020025
I tried resetting the PC, hard resetting the controllers, unplugging the tri-cable at the break point, disabling the device, then replugging it and letting Windows reinstall the drivers, etc. and nothing I did worked. 

I did manage to resolve the issue just now, but it really just raises further questions. I started dicking around with developer settings and turned off Power Management, and that fixed it for some reason. I thought the Power Management setting was so the lighthouses shut off whenever SteamVR wasn't running. And I have no idea why I was only having tracking issues on these newer games, and not on anything else I had played, including stuff I bought and played after buying and installing the "faulty" demos and Atlas Mystery.