Not sure if RAID still has all their manuals downloadable, but when they did, I downloaded like crazy.
Looking at the file OC_Open_Water_Instructor Guide_V2_3_17Jan19.pdf, I noted the content on "Check correct weighting" on page 8. If required, while a bit rough, this should mitigate grossly overweighted students.
Looking at OC_OW20_8_Confined_Water_Training_ENG_V2.05_04Oct19, section 8, page 6, the buoyancy workshop is decent. I like the part of determining of how much weight the diver needs with just their exposure suit. I don't see mention of these being rough methods and needing to fine tune at the safety stop with a nearly empty cylinder (or I missed it).
@VikingDives
What's the filename that is the instructor's playbook? Not finding it in OC_Open_Water_Instructor Guide_V2_3_17Jan19.pdf
RAID_INSTRUCTOR-PLAYBOOK_(confined and open water training)V1.01_23-NOV-2020 is what I have, but I may have partially renamed that... I'm happy to share it with you if you like.