Hey Smack,
Interesting log there, however you should take a break until you have your back checked.
I came across a similar training log in another forum long ago, a powerlifter training to achieve his 600 pound back squat. Everything went well until he experienced lower back pain, which he thinks it's just bad DOMS or a minor tear. He brushed it aside and kept on training with a lower volume week after week until one day the pain was unbearable. He decided to check himself into the Emergency Room and his next post revealed that he had been diagnosed with multiple herniated discs and needed surgery ASAP. After that, he have a choice to quit lifting forever or continue lifting and risk another back injury which could leave him paralyse or even dead.
Just saying that don't treat back pain as a walk in a park, get it checked out as soon as possible.
All the best,
Kev