thanks!
regarding the framing, it generally works reliably with the sides cropped off in the liveview. when recording, it zooms in more, but it is perfectly smooth and it's great for focusing

occasionally, however, the liveview is zoomed in all the time. i ran into that with the first take on this recording. i had to restart the camera after trying random tinkering, but nothing fixed it until restarting the camera.
i haven't tested it yet but i'm wondering if it might be related to which video mode is selected when starting the camera?