Hi Kurtis, great question!
I have always found it was easier to let VAK preferences shine naturally and letting the student reveal them to me by really paying attention to key words that they use when conducting over the phone/computer interviews. I love asking a question about their learning style, as in, "how would you describe your ideal learning environment?" Multiple layers of VAK preferences will often be highlighted and that gives me a foundation to shape my adjectives around their preferences.
I am interested to see other best practices from others too. Thanks for a great question.