Rred
Contributor
IIRC those Faber tanks do have negative buoyancy even when empty, so they should NOT actually be causing you to add lead. Your buoyancy is coming from something else.
I used to have an odd couple, one Alu80 and one steel 96, and didn't like mucking around with my weight belt to match whichever one I was diving with. The Alu80 has nearly ten pounds more buoyancy when near empty. So I took ten pounds off my weight belt, melted it down into a disc, and used silicon seal to glue that to the bottom of my Alu80. Now the tanks matched.
I'd say to figure out where the buoyancy is coming from, which way you need to be trimmed, and then consider using lead sheet or lead shot (sewn into a sleeve as needed) to make whatever trim weight you need, where you need it. There are some things (like a 1/4" full farmer john(G) that simply require ballast, tanks or no tanks.
I used to have an odd couple, one Alu80 and one steel 96, and didn't like mucking around with my weight belt to match whichever one I was diving with. The Alu80 has nearly ten pounds more buoyancy when near empty. So I took ten pounds off my weight belt, melted it down into a disc, and used silicon seal to glue that to the bottom of my Alu80. Now the tanks matched.
I'd say to figure out where the buoyancy is coming from, which way you need to be trimmed, and then consider using lead sheet or lead shot (sewn into a sleeve as needed) to make whatever trim weight you need, where you need it. There are some things (like a 1/4" full farmer john(G) that simply require ballast, tanks or no tanks.