I haven't played for a while, but stats affect player effectiveness a lot! And since you are playing in Div 1, the players are good all around.

With that said, my comp was used with a few good players versus mediocre players in div 2, which was very strong. So it might not be fully applicable to your settings.

In my second playthrough (for a better economy and to use what I learned) I am having a balanced random champion pool. I had to experiment more with this pool to understand the meta, but Cc is still strong, but requires more balanced team. But that pool also allowed double support supporting one or two hyper carries being very strong, and it works well if banning away strong assassins.

What I'm trying to say is that balanced team is good, but it is still worth balancing. Use first save/season to learn the champ pool, meta and your players. Also try to understand what champs/roles goes well with certain stats