Hey andrewdko,
Unfortunatly, I don't know what build of Magic Lantern that is. I'm assuming in later builds of crop_rec_4k_mlv_snd they moved the Data format option to be in RAW video. However, the latest build of crop_rec_4k_mlv_snd on Magic Lantern's website still doesn't support recording at lower bit depths with high resolutions. Good news is I found out that Danne (a contributer on this fourm) has made a build that allows you to override the bitdepth set in RAW video. Give it a shot, and let me know if it works!
https://bitbucket.org/Dannephoto/magic-lantern/downloads/
Unfortunatly, I don't know what build of Magic Lantern that is. I'm assuming in later builds of crop_rec_4k_mlv_snd they moved the Data format option to be in RAW video. However, the latest build of crop_rec_4k_mlv_snd on Magic Lantern's website still doesn't support recording at lower bit depths with high resolutions. Good news is I found out that Danne (a contributer on this fourm) has made a build that allows you to override the bitdepth set in RAW video. Give it a shot, and let me know if it works!
https://bitbucket.org/Dannephoto/magic-lantern/downloads/