First: I wanted to show an above-minimum opener that wasn't strong enough to jump shift. (Some may think I'm strong enough to j-s, but that's not relevant to the discussion of GIB's understanding of the possible sequences.) Therefore, I refrained from jump-shifting at my first opportunity, then jumped at my next chance. 3♠ was explained as 19-22total. At another table, South opened 1♦ then jumped to 2♠ after 1♥; this was also explained as 19-22total. Shouldn't my sequence be something more like 16-18?
Second: It's my understanding that when I have the higher of my two possible keycard holdings, I am supposed to "correct back", or over-rule partner's attempted sign-off. Am I supposed to refraining from doing that on hands like this, where I've shown a strong hand that really couldn't possibly have no keycards?

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