My rig:
HammerHead SS BP (5.5 pounds)
Oxycheq signature wing
Diverite Deluxe Harness (Don't be confused with an adjustable harness)
Diverite SS STA (its very light weight probably about a pound or less. It looks very similar to the
Oxycheq STA)
Apexs weight pockets (I only use these with a drysuit.)
I like the Diverite Deluxe harness because I can adjust for different exposure suits by just tightening the chest strap. I've used it from everything from a rash guard to a dry suit without having to do any adjusting to the straps.
I've taken this on several trips without a problem. It packs smaller than my old brigade. I would have Mach 5 wing if thet were available when I bought my BP/W. With steel tanks I need no weight in fresh water even with a full wetsuit.
In salt water I need no weight with steel tanks, and usually only 4 if I use aluminum tanks with a light wetsuit. Just for clarification, are you sure you are using steel tanks rather than aluminum? I don't know of steel tanks that are normally filled to 3000 psi.