I think its pretty close was playing back and forth with the novice to expert seem to help you fine tune it to yourself. Yeah I did use that much weight in the beginning and now I use much less weight.
Now is the algorithm readily available or willing to share cause this would be good for an app for my phone.
Or incorporated into a DiveBuddy app where we can check out the Dive Buddy website and forums and of course use the weigh calculator.