So, I've been training for a year. For several reasons (at the top of the list is being a pussy) I've not quite made the progress I believe I could have. I started my lifting journey at 6'0" 150 lbs, and I'm currently 210 lbs. My Squat/Bench/Deadlift went from 115/105/175 to 315/245/315, respectively. I accomplished all of this using Mark Rippetoe's Starting Strength program, as well as using it to learn form.
It is becoming obvious to me that the form he describes, though simple in application (as it is intended to be), is not optimal for powerlifting. I don't claim to be strong, nor do I claim to be a powerlifter. I would like to be able to enter a competition for fun, and I'd like to be strong one day. I want my Squat form to be decent for a raw Squat.
This is from my last normal training session:
After a bit of fooling around, I realized the balls of my feet were being loaded, which (to my understanding) makes the lift far more quad-dominant. To begin training myself in a more PL-style Squat, I've decided to start Box Squatting. Today looked like this:
After this, I learned that rocking on the box is bad. I wasn't losing tightness, I was relaxing my hip flexors. I saw powerlifters doing it, so I assumed it "should" be done. I can box squat without doing this.
Anyway, I need some guidance here. Someone point me in the direction of obtaining better form for a powerlifting squat, please.