Ok: don't make judgements about anything, especially your own goals, when you're working on just five hours of sleep.
Be careful on the GM's. Don't forget to clench your upper back and glutes when you lower; otherwise you risk those kind of imbalances, shifting slightly to one side and straining it. If you're going to push yourself this hard, then you have to get more sleep. The combo of extra exertion and no sleep=injury and failure. be careful!
As for the squat form: I'm no coach, and I only think I get what you're saying. I do know that you certainly aren't supposed to keep your upper body straight up and down. A forward lean is expected. You just want to make sure it's not too far.
When you feel like you're rolling onto your toes, start your next rep with heels dug into the ground and your toes pointing upwards. In other words, purposely take your toes off the ground, which will force yourself to sit back on your heels (so only the heels and balls of your feet touch the ground.)
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