Rather than trying to touch the bar to your chest or reaching your chin over the bar (both of which can produce dysfunctional mechanics), the goal should be to achieve proper upper back and lat activation. This requires several components.
You got the introduction to MRT last week, now here's the meat. If you've got limited time but want maximum results, this is your baby. The cool thing? The workouts won't take you much longer than 30 minutes.