Sorry about that Maris, I fully agree with you that an f/8 90mm lens with a dark subject in a dark place is interesting to focus, more so with rear tilt movements then refocusing.
I once had someone explaing to me how to focus a 4x5" monorail to get everything in focus with a product shoot, which was very informative for me. Trouble happened some days later when I found rear tilt worked a treat, I didn't notice the group of square cruets placed in specific places, as per the shooting plan, were starting to "Stretch", as it were.
Using E6 and waiting 30 minutes after an exposure to find my wonderful exercise was in vain, not to mention pressure was now on to get the shot out of the way for the next set-up and for Heaven's sake, didn't I remember anything.
Pressure and mistakes are a wonderful teacher. I learnt so much in such a short time I wonder sometimes how I remembered it all. When I need to remember it these days, I realise I have pretty much forgotton so much of it; or at least I have to work to remember.