First off moe i would like to say 405 for 8 is very good. What i do is 135 for 20 reps, then 225 for 15 reps, then 315 for 10 reps, now it is time to add the weight 405 for 5 i could do more but im saving it for the singles then 495 for 3 reps 545 for 1 565 for 1 rep then 585 for 1 rep last one 600 for 1 rep. Then the next week i do half reps in the power rack from about the knee's up and i go very very heavy. Try this out let me no how it work's out for you hope i helped you.
PAIN IS JUST WEAKNESS LEAVING THE BODY