The key is not to jiggle

1rep max Overhead Squat

Here is Mitchell with a 145# OHS


The key here is control. This movement should not be rushed, it should be deliberatly slowed down to where you control the weight both down and up. Make sure you take that deep breath before descending and hold it through the whole motion, find the spot where the bar feels stable overhead and keep that position throughout the motion. Ver important to have ACTIVE shoulders, drive that weight through the ceiling and hid your ears. DO NOT let your elbows bend or your shoulder blades drop down. And most importantly commit to the lift once it is overhead commit to finishing the lift safely of course.