If you're continually missing PR attempts off the floor, try using block pulls off 3-4 inch blocks. This will allow you to challenge your hip and back position at an angle that mimics where the bar will be right after you get it off the floor.
Experienced lifters should do these with a quick set-up and a rapid descent.
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Tip: Rounded Thoracic RDL
This accessory exercise for the deadlift will strengthen your spinal erectors. This helps you to deadlift heavier while keeping your spine stable and safe.