A discrepancies in resources/finances already exists between nations.You have raised some good discussion points.
Two main points for me:
Legalising drugs doesn’t necessarily help to even out the playing field, countries / companies with more resources will still be able to give their athletes the latest / best drugs on the market.
Also, how can you legislate to ensure the drugs given are not harmful, and who determines what is harmful and how? There will always be rules broken when athletes and their coaches / countries are looking for a minuscule edge in search of a gold medal.
In principle I am in favour to a point, the system is broken and I don’t think all currently banned drugs are bad - but I can’t see how it could be successfully implemented.
Good luck with your final year.
P.S. How come you are quoting actual statistics and sources? You won’t get very far with that kind of approach