So the update to 1.6.1 is great and AV1 encoding performs better on my E5-2697v2's than I'd had expected, especially considdering their lack of AVX2.
That said, something was introduced with this version of the docker that has absolutely wacked the scaling. It always tries to fill the full screen window, resulting on a massive Handbrake window with everything spread out on a 1440p monitor. And you make the window smaller and now it's scaling that image down, resulting in fine text that's unreadable. Whatever was done in the previous docker, with a fixed scale, and scaling down if the window was too small, was fine. This change makes everything a lot less flexible.