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With several hundred dives, you should be able to figure out the answer to "What should I do ? I feel I should wear a weight belt with one weight on when using the double config."
Hopefully, your experience will have also taught you that there is a significant difference in buoyancy between the various models of tanks, and that it is ridiculous for someone to advise you on weighting without knowing whether you have a pair of buoyant aluminum tanks, or a very negative doubles set.
Nor, with your experience, should you need someone to point out that, if you are struggling to stay down in a (freshwater??) pool, that you will be positively buoyant in the ocean.
Well I have several hundred logged dives but would by no means claim that I am an expert in diving; however I am fairly confident in my buoyancy skills when using my regular equipment.
You have to go back to square one. Do a buoyancy check and get properly trimmed out. Take an hour or a week for it but get it sorted and you'll feel much better and have more free attention for the other things you're supposed to be learning.