The biggest deadlift problem? Not having a proper setup in terms of where the bar path begins and ends.
In short, don't set up where the bar is too far away from your shins. This creates a large lever arm for the lower back and huge sheering forces.
The bar should start right beneath the shoulder blades, close to the shins. This will set you up for a proper pull – the bar will go up and down in a straight line.
Has your bench been stuck so long you've considered loading up the bar to your usual weight and just welding the damn plates on? If that's true, it's time to bust through that pesky plateau.
Jim Wendler lists the best in conditioning, getting stronger, assistance work, home gyms, and strength training books, along with torpedoing the “best” myths.