This was a really good description. I succeeded in following up your description together with the one given in the manual for 1 point on 5D mark III.
I faced the problem, that the focus between the pictures did not change, so I had always the same picture
. - Solution for me is "delay time"
So finally using above descriptions for 1 point:
1. Chose step size from "small", "medium" or "large"
2. Use AF (or arrows) to focus on first point. (This works only for the first point, regardless if it is near or far)
3. Long press (1) button to remember position
4. Move AF-field to second point by touch screen and focus with the arrows (not with AF-Function/button), using always the same arrow,
(same direction, same step), otherwise the position (1) is cancelled.
(Try this, always having an eye the stored focus and you will know what I mean)
5. Set "start point" as (current), "end point" as (1)
6. Number of photos is calculated automatically
7. Focus movement direction is set automatically
7.5. Add XX seconds delay between the pictures, so that there is time to store the data.
I recognized, that this time is very important
and must be in any case exceed the storing time and the image review option of the last picture on the cam, which was 4 s on my cam. I also skipped image review in qDD.
After I deleted this time on my cam, and increase the delay in qDD upto 3 s, I could do focus stacking even in RAW.
Before this steps, the focus did never change and stack always on the same point
8. Press qDD shutter button to start capture sequence.
with 2 point I could not succeed, for what ever reasons, but 1 point is good enough.