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.
A lot of you have been training for years, and as such have experimented with dozens of training methods. Most are probably long since forgotten, like the girl with the braces and padded bra that you dated once or twice back in high school. There wasn't any chemistry and you went your separate ways.