Keep in mind that I’m no expert but I watched both of your videos and here are some suggestions I have.
Squat: Keep tighter, it seems to me that you could use some of @Alpha’s tips.
Deadlift: Stop yanking on the bar so much, that’s probably how you ended up tweaking your lower back. The breathing video would help in this case too.
Oh and awesome, [quote=“danglingneuron, post:1, topic:216892”]
I am serious about changing my lifestyle
[/quote]
you’re making a commitment you won’t regret. Keep up the good work.