I find putting all of the lead in my weight integrated pockets is best with a thin wetsuit, but with thicker wetsuits, it is best to spread the weight around between belt and BCD.
I find that removing and replacing my weight integrated BCD mid-water is reasonably easy when wearing a 3/2 mm full wetsuit. With a 5mm full wetsuit and all of the lead in the BCD pockets, it gets a bit tricky. The BCD + lead wants to sink, me and my wetsuit want to pop up. With 7mm wetsuit, I put part of the lead on a weightbelt, even though with my skinny hips and no butt the belt wants to slip off when I'm vertical. Not only does a weightbelt with the 7mm keep my buoyancy in a reasonable range, trying to put all of the lead into the pockets of my BCD is pushing the limits of what it can hold, making inadvertant ditching of the pockets more likely.
My advice to the original poster is to take off his BCD, adjust the tank camband, and then put the BCD back on, all while at about 15' depth. If you can easily do it, then go ahead and leave all the lead in the BCD. If you have problems, then look at putting some of the lead onto a belt or harness.
Obviously, my comments about lead in a WI BCD also apply to steel backplates, negatively buoyant steel tanks, STAs, and keel weights in BP/W rig.