WyPlayer,
From your posts it appears you already have a pretty good hunch what you feel is best for your career in the long run.
For reinforcement, ask yourself, “Does it make sense to swing down on a ball that’s already traveling down when the most positive result you would be striving for would be a ground ball”?
“How many major league hitters swing down”?
With that in mind, if someone were still teaching hitters to swing down, I’d stay as far away from them as possible. It’s no telling what else they might want you to do.