How much weight did you need with the 7 mil (farmer john?)?
I count the weight of the BP + STA + regulator 1st stage as 10 lbs. Initially, when I dove with the 7 mm (one piece, not farmer john style) I needed 16 lbs of lead. I couldn't get that much weight into the tank pockets so I added the pull out weight pockets on the waist strap of the BP. Eventually, I was able to drop 4 lbs of lead and able to get 12 lbs (6+6) all in the tank pockets. When I was able to remain neutrally buoyant throughout the dive I ditched the waist band weight pockets.