Everyone is different when weighting. There are to many factors to say someone should wear &*&*^* pounds. I teach my students to weigh themselves with a tank about 500 psi then go to the bottom of the pool or 15 foot whereever and take off their mask and do a few skills there without the mask. The reason I do this is if the are weighted properly and relaxed when the get in the ocean and are excited on their safety stop bouyancy will change. Doing the skills without a mask builds anxiety like being on the safety stop does.