Start at the mid-thigh position - jump. That's it. Quit thinking about it so much. The DKB will happen correctly and naturally if you get yourself into that solid mid-thigh position before you fire off that final hip extension.
Once your sn/cln from the mid-thigh is good, start at the knee, and gradually move to the floor. You can work 3-position snatches/cleans also -take one from mid-thigh, another immediately from the knee, and then the last from the floor.
Also, you can work halting deadlifts -DL to that same mid-thigh position and hold it for a few seconds before returning. Ingrain that position and continue returning to it when you get confused.