I've been doing starting strength for a couple weeks and here are a couple videos of my squat and bench today. When I started SS my max squat and bench were 240 and 205 respectively at a bw of 150.
On the bench I make sure I have a slight arch in the lower back, I pull the scapula back towards each other and drive my heels though the floor. And the bard touches below my pecs, right at xiphoid process kinda.
On the squat, I saw in the video that in the bottom my lower back starts to round is this a matter of not good enough flexibility?