I use a SS bp/w (-6 lbs) + weighted STA (-6 lbs)+ two Halcyon trim (0 to -5 lbs each) attached upside down on the lower cam. That gives me a range of - 6 lbs to - 22lbs.
I always dive dry (Trilam- Santi Elite) with the fourth element undergarment system and steel tanks. When in Warm waters like Aruba, I use about
-6 to -8 lbs total. I remove the - 6lbs weight insert from the STA and throw a couple of pounds in the trim pockets. For colder water I use -12 to -18 lbs total.
When diving doubles, just the SS plate (-6 lbs).
No real ditchable weight except for the trim pockets.
With that said, I always dive with an 80 lbs liftbag attached to the bottom of my plate in a pouch and a 6 ft SMB stored in my bp pouch. Spool in thigh pocket.