I figured out a solution and it turned out to be simple. The question you asked "How does the AI2 Bluetooth component know to immediately send the text, rather than to save it up to save on bandwidth?" gave me the key to solving my code problem. I hadn't realized that the app might buffer data before sending. I added a Carriage Return \r to each Send Text block and now the app/car interface works as I had wanted it to. Here are the revised blocks:
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