manni-yunk
Contributor
I doubt that the OP will need more lift than what the Ranger wing provides. That said I would worry more about what happens if that wing fails.
Adding a SS plate will give 6lbs of negative buoyancy, 2 x 10lbs negative for each cylinder when full. Add another -4 lbs for two regs. And now you are looking at at least 30lbs negative buoyancy. None of this weight can be ditched. Sure some is offset by the body but none by the wetsuit at depth. Swimming that much weight up is going to be very hard at depth.
As such, with a wing failure the OP is going to go down like a bloody led zeppelin. As such, I am going to call BS on the OP for what they are trying to do with steel cylinders and others recommendations like get a SS backplate tech bladder.
Im not sure what you are calling BS on. Plus your math seems to be rounded up to the extreme. steel hp 100's are between -8.44 and -8.8 (Using Faber and PST specs and including valve) bouyancy. My 50d first stages weigh 2 lbs.
So its a lot closer to 20 lbs...than 30....right?