I have max squats of 680 (4-6 reps), max flat bench of 450lbs (4-6 reps), but my deadlifts are low in my opinion 360-405lbs (4-6 reps). Now im 6'3" bout 250lbs and im wondering how to step up my weight in my deadlifts. I was thinking it might be cuz of my height but im not sure. Its just annoying that my training buddy is like 5'10" and about 170lbs and does as much as i do but doesnt touch me on my other powerlifts. Any advise would be greatly appreciated.