Flaws in your squat technique will hold you back from progressing. Overhead squats can improve the squatting pattern and should be a regular part of your strength training program.
The overhead squat requires a more upright posture than the back squat and you're forced to execute the squatting pattern precisely, otherwise the bar would drop to the front or back.
Have a look at the video. You can see the high concentration level of the athlete and accurate execution.
Some of you might have enjoyed the Diary of a Steroid User series as much as I did. It was an interesting, unapologetic, honest portrait of what it's like when an average Joe uses steroids. But however much I enjoyed it, I cringed when I read some of the "pyramid" workouts outlined by the anonymous author