Great idea and we can start a topic on ballast flow tests in Shop Talk / ballast section. I planned on taking a few before and after flow measurements as well when I update my ballast and would love to hear more about your findings.
For now, let's keep this this thread open for more questions about this ballast bag port project. Thanks again, Cowwboy for the post. I might have more questions if I fix those older bags with a broken fitting.