[rs77]

as I understand all those mods:
- GWX 3.0 - positive buoyancy (surfaced displacement > mass)
- Rubini's B&D - neutral buoyancy (mass = 0, so mass = displacement) + put them deeper into water by increasing surfaced draught
- StzSinkingFix - more positive buoyancy than in GWX 3.0 for some ships

example NKSQ_:

1. in stock GWX 3.0 it has little positive buoyancy, mass = 1958,5; displacement = 1960,0

2. Rubini's B&D, mass = 0, displacement = 1960, according do S3D in this case game treats it as mass = displacement, so buoyancy is neutral

3. StzSinkingFix, mass = 1664, displacement = 1960, so we have more positive buoyancy than in original GWX 3.0 and much more than in B&D mod

so ships which have problems with sinking in heavy sea in GWX 3.0 will have much more problem with B&D mod

cheers