"full 340-1" - not a guarantee of victory in the official match (as in the associations). guarantee of victory in official tournaments - a good draw.
if you want to win 10 trebles in a row - it is not necessary to train players at all - enough to leave only 14 players 1-3* on the last day of the season and buy players 4-5* on the first day of the season. You will play with teams 1-40% and your team's rating will be about 60%.
from the latter I hope you understand the scale of the manipulations of all managers, it does not matter in the top-100 or not. that's why I'm writing - to limit the auction for the period of matches of associations, the first and last day of the season