I doubt it, but it's possible. I do a lot of overhead pressing with somewhat heavy weights(5x3) and I don't have problems such as leaning back. I keep my body straight/upright, but that doesn't mean they couldn't be too weak for squats.
With any weight, every time, even when doing them Bodyweight.
I'll have to remember this.
I do this.
Will do. The sitting back on my heels will definately be strange at first, but I know it'll become second nature very quickly.
Looks like there are a lot of things I forgot/didn't know to do form-wise.
Thank you all for your tips and video, I certainly forgot about the Squats Rx. I will start doing what was suggested, add stretching everyday and before training and try to improve my form and I hope I'll come back in a month and report great squat form.