Exercises for these muscles consist of pulling the arms back as in rowing, and pulling the arms down as in chins and lat pulldowns. The main contribution of the lats in the deadlift is to keep the arms in and back during the pull. So, it would stand to reason that an exercise that pulls the arms back, like various rowing moves, would be preferable over pulldown moves like chins. To save your back from extra stress, try one arm dumbbell rows or another exercise where the back is supported. Positioning for the deadlift is critical.
Many newer lifters start the lift with their shins too far away from the bar.
Their initial pull must bring the bar into their body, then up. I suggest getting your shins no more than 1-2 inches away from the bar, if not right up against it. Another technique to use in training would be not to bounce any of the reps no matter how light the bar is loaded. Also, bouncing the bar between reps may leave you in an unadvantageous position which may result in a poor leverage position or again, open you to extra chances of injury. Pause and reset your position between every rep of every set.