So you are going this to improve your powerlifting.
Now when you are stuck at the bottom doing the snatch, are you you not ass to the ground with the bar over your head?
If that's the case, why wouldn't you go "all the way down" each time you are doing overhead squats.
If its used to help get out of the bottom portion of the snatch, well you have to get back down there when doing OH squats.