Jim, I'm now calling if "fine tuning." I need to shift weight up or down my back slightly so I am perfectly tuned in the water. That's with the 300G undies. I'm pretty close but not quite there yet.
I want to "dial in" the 400G undies which will require more weight adding and shifting.
Jeepers man. Just get things reasonably squared away and go dive! You're not gonna die if you're 10% outa trim!! I think you might just be over thinking this thing a bit.