For your setup, I'd say try to squeeze yourself into place slowly on step five, instead of the aggressive jerk you're doing on most of your reps. Doing that runs the risk of jerking yourself or the bar out of position - it won't matter much...until it does. Build the tension slowly and surely until the bar breaks off the deck.
Zohar's recent article presents another good way to envision it: Improve the Deadlift’s Low Back Position off the Floor: A Conceptual Approach | Zohar Yermiyahu