Even though you can pair a 24mm lens, that focal length only corresponds to a small area of the depth frame, so you’ll be effectively cropping away much of the depth sensor’s resolution. A 16-17mm lens is a better match for the depth sensor.
When recording, are you dropping any frames as reported by ‘Frames Dropped’ above the record button? I assume having “shot with a lower resolution” means you changed the sensor’s color mode (which is often helpful for increasing capture performance) - Changing your Cinema camera’s resolution requires you to create a new lens profile and Camera Pairing.
In the Editor, is “Dropped frames, can’t proceed” what you see when you rollover the alert (
) icon? Is there anything else in that warning message, or any messages in the console when you link the Cinema clip to your Depthkit clip? Without linking the Cinema video, does the capture play back smoothly, or is it choppy? If you export the Depthkit clip as a Combined-per-Pixel video without having linked a Cinema video, does the resulting video play back smoothly, or is it choppy?