The mid-shin portion of the deadlift includes a lot of leg extension, and weak quads will obviously be a problem. Fix the issue with a partial assistance exercise called the floor to knee deadlift.

1. Stand on a slightly elevated surface, about a half-inch from the floor.
2. Slowly pull the bar only to the knees and go back down, keeping the torso angle the same throughout the range of motion.
3. Don't touch the floor between reps.