FWIW I spent many months applying Rippetoe's squatting principals to good effect. Recent belt-less sets with that style (which looks a LOT like yours) include 405x6, 425x3 and 380x8. I believe the style works fine. Other than locking out at the top, which you already know about, yours look like very good Rippetoe squats. Your bar path is very good. Straight up and down, right over your foot. Nice work.
I no longer believe Rippetoe's style is the BEST for moving the most weight, as others here have alluded to, Reed included. On the advice of Reed and others here, plus the advice of a powerlifting coach I worked with on Saturday, I will be changing several things about my squat.
1) Full grip on the bar instead of Rippetoe's thumbs-over grip. I was doing this on Saturday and it seems to help me get/stay tighter.
2) Head in a neutral position. As I've gotten stronger I've noticed that my head has a natural tendency to assume this position during my heaviest sets of max exertion. I've caught myself moving my neck up three times under heavy load, and I don't want my neck to be moving at all during a squat.
So, in short, I've had success with Rippetoe's principles but I am pleased to be trying new things and figuring out what works best for me. I would encourage you to do the same, but if these squats are feeling good and feeling strong, there's nothing wrong with keeping your foot on the gas for a while and getting stronger with this style, assuming your body likes it.