EFX
Contributor
The issue of proper weighting or overweighting depends on other factors besides buoyancy changes. Two I can think of is initially getting to some depth quickly and the other is to get deeper quickly from a safety or deco stop in shallow water. An example of the first scenario is a group doing a drift dive where the surface current is higher than the planned depth. You want all the divers down quickly to minimize the seperation between divers. The second scenario is getting down quickly from a safety stop if a boat is coming. In either scenario being "properly weighted" for buoyancy changes will get you in trouble on the above two dives. Adding another 2 kg would be proper weighting and overweighting in other situations. Excluding the above scenarios tha answer to the op is no.