No I have never owned any Leica camera, and I know nothing about Leica cameras, specifically.
I do have enough experience digitizing negatives from my Rolleicord, Pentax and Konica cameras to have a pretty good idea about how all of that works for the person who is scanning their own film at home.
But I am much less knowledgeable about how labs scan film for their customers. Is that a hands-off automated process? -- or does a skilled operator take the time to make frame-by-frame or roll-by-roll adjustments to fine tune the results for each customer? I don't know.
As far as learning anything about exposure, I think your last roll of film is probably water under the bridge by now. The next opportunity for learning will come with your next roll. Ask the lab to have an experienced tech look at the negatives from your next roll and give an opinion about your exposures. If they can't do that, ask to get your negatives back and photograph them with some kind of back light for posting here. Something like this:
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