whats my problem?

maxed out today on zerchers… i hit 440lbs for a single, i was pretty happy with that, BUT…

My squat PR is 450, and my dead is 515?

my zercher seems to be way out of proportion to my squat/dead.

my form is correct, i lowered it to the pins in the rack,(around knee hight) even paused for a second at the bottom, and i only just missed 460lbs which would beat my squat PR.

any thoughts?

bump

hamstrings, lower back, and possibly upper back.