The parking brake system in vehicles over the last dozen years is designed around a balanced tension system, the cable's end springs at the drums vs the torsion spring at the take up reel. It is not a hard connection at the pedal and you will always be able to pull back against the reel and play out cable. As you apply the pedal a racket pawl contacts the reels teeth and applies the cable tight.
The small amount of clearace in the drum assembly is only about 0.030" at poor adjustment, so that is the most you are going to take up bu adjusting the drum shoes tight. And it doesn't matter and since the take-up reel at the pedal is not in "locked" mode, it will just play out that 0.030".
If your parking, not emergency brake, is not holding you've got other issues then cable play.