Been half keeping an eye out for other dependencies related to this post. viewtopic.php?f=2&t=11446
Not sure if these have been accounted for and or now known but thought i'd post anyway. Amphibious units leave full mass in sea (Exps, wagner/brick/percy, sacus) Hover doesn't. HARMS leaves full mass but t1/t2 torp launchers don't.
And SACU upgrades done after gate don't count towards mass (but presets do) but I seem to think it is already well known?