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.
You finished boozing it up over the holiday? Good. Cuz it's time to put what's left of your brain matter to use in understanding the nervous system and how utilizing it can make you stronger and better lookin'.