Welcome @bpollina, a very interesting first post. After you get your question answered, you may want to introduce yourself here:
I am not an Xdrip user currently, so I can’t answer everything, but I can answer two of your three questions.
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The physician’s office provides the number that you put into clarity to share. If they don’t provide you that number, you cannot automatically send them data.
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Dexcom uses a different algorithm than Xdrip+ to show you your current readings, so it should be no surprise that the Dexcom and Xdrip+ give you different readings. My guess is that Dexcom does more smoothing than the simple algorithm in the Xdrip+ app. I wouldn’t think the long-term results would be that different, but each person reacts in a different way.
As to 3., I am sure @docslotnick or another Xdrip user will be along shortly.