I think I have comparatively short arms vs legs and this is making me very injury prone to deadlifts. I have tried numerous cues, hamstring flexibility but no matter what I've tried, there is always a slight curve in my lower back off the floor. is there something I can fix here by setting up further away from the bar? Am I relegated to block pulls? Context: I have no ambitions competing in any powerlifting competitions, I just train at home with the goal of deadlifting 405 for five reps.

Bench Press: 225x5
Squat: 255x5 // 315x1
Deadlift: 275x5

I AM ALWAYS INJURING MY LOWER BACK ON THE DEADLIFT.