I find the I have similar issues when using my Hasselblad Arcbody. There are so many things to remember to do and on days when my mind isn't as engaged as it could be I am asking myself, is darkslide out, did i close shutter before I removed DS, what back have I got on, have I allowed for the centre filter in my exposure calculation, tilt/shift, lens shade adjusted, those moving boats have I got enough shutter speed and then the moment is gone. Is all worth when I get it right and 12 shots a roll is a little easier than with 617.