Have a large well-upgraded demesne compared to your individual vassals, 9+ for kings, and 12+ preferably for emperors.
Land family members only, and go elective, marry most of your children inside the realm for NAPs. (yay incest)
You don't need to give the council any power at all, if you don't want to.
I'm currently running a relaxed Passau -> Germania game, and have had my council abolished all game.
I've faced a total of 1 revolt the entire game, and that was when I decided to end a crusade for Aquitaine by chain assaulting holdings.