I see what you mean, at the bottom his back looks flat, but then it seems to me that he raises his chest a little - causing his back to arch - instead of driving up with his hips. The bar could be a...

Veryhrm, where is the flexion? All I can see is a bit of over extension.

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The hip thrust before each rep looks a bit odd to me. What is your reasoning for doing that?

Looks like you could do with shoving your knees out wider too, and keeping them wide on the ascent.
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Whatever you looked up clearly didn't help. You're still not "getting" the hip drive concept. Did you watch the video of Mark Rippetoe teaching a kid how to use hip drive that I linked you to above?...

You're overthinking it. Your basic mechanics are fine. You just need to be more confident. Get some mongrel into ya and power the weight back up. You're going too slow on the way down too, which is...

Yeah, still no hip drive. Have you got the book? It's all explained in meticulous detail in there. The kindle version is cheap :-)

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That sounds right to me re: deadlift.

I'm pretty sure I've read on Rip's forum that the best thing for strengthening and protecting your rotator cuff is to overhead press. Definitely do dips,...

Could be optical distortion from the lens being closer to the quads...

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Looks ok from here :)

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Ahh I see the foot rolling now, well spotted spar and jimmy :)

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Also you're doing something weird at the top of the pull, arching your back or something. Just stand up straight.

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The weird hip dip before the pull occurs because you haven't fully extended your back and taken all of the slack out of your body. You drop your hips, then they shoot up to their correct position...

Back looks heaps better, good control. Briks42 is right about the neck craning. Your neck is better when you start the pull, but once the bar leaves the floor you crank your head back. Maybe it would...

Are we watching the same videos? Knees look solid to me. Maybe slight deviations on the heavier set. Nothing to fret about.

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You have a total absence of hip drive. Watch this video for a demonstration http://www.youtube.com/watch?v=yha2XAc2qu8&feature=youtube_gdata_player

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Looks pretty good! Awesome power rack too

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Your stance is too wide, bring your heels directly underneath your shoulders. And don't pause at the bottom.

Film your next set from 45 degrees to your rear so we can get more of an idea of what...

Is the pain in your forearms another squatting tendonitis symptom? If so, you should do chin ups rather than pull ups. They will hurt, but you'll be amazed at how much better you feel afterwards :-)...

The sit back/back angle is fine, you just need to get your knees out and locked into position while you sit back. At the moment you are flicking your butt back THEN bending your knees.

What worked...

Your depth and rebound look good now. You're starting to exaggerate the "sit back" cue when you initiate the descent - knees and hips should break at the same time.

Don't worry about assistance...