Try figuring out how much you need for your current setup, wetsuit, & bc to stay neutral or just 1feet below the surface or be able to freedive. Once you know this then you just add +3-4lbs to help sink the AL80 when it’s near empty. It may take you one dive to figure this out so put loose weights near the boat entry and tell the deck crew you will be asking for more weight if you need to. Add in increments of 2,4, &5 til you work it all out. Then record it in your log so you can remember it.