After trying a high detail scene, and moving the camera I exceeded 17 Mbps. Thanks for the tip, abasfly!
MediaInfo:
Format: AVC
Bit rate: 23.5 Mbps
Maximum bit rate: 16.6 Mbps
Width: 1 280 pixels
Height: 720 pixels
Frame rate: 29.970 fps
Patch done with 3.36 (latest). Settings 50/52/60. Card: Transcend 16Gb/Class10. Lens: 20mm/1.7@f8
I will test some macro shots and see if that increases the bit rate.