Welcome aboard Jay, your progress looks good and it is good you got a coach to help early on with your squat form, now check the book and make sure he is in accord with what Mark teaches, cause they don't all say the same thing. The biggest issue I've had with the squat is keeping my lower back tight, I hurt myself last year and lost a lot of time, now I use a belt to help. There is a very good video on the web site on that issue if you're not sure what I am talking about.
http://startingstrength.com/index.ph...sition_control You didn't post your age but if you're not a geezer your progress should come along very quickly. Look forward to seeing your posts.