I've tried a bunch. All want to re-encode except the avc one, and that seemed to max out around 14k bitrate even when I selected 21,996,000 or whatever it's max is.
Edited to add: all the settings are 720p, I figured I shouldn't upscale to 1080p. I've tried both 59.97 GPS settings, 29.97 and 30 fops as well. Mp4 both Main Concepts, and Sony.