You posted your video on here because you wanted to get better at deadlifting.
Things that will help your deadlift guaranteed:
Buy Starting Strength by Rippetoe read the Deadlift section.
Go to Youtube watch Clint Darden deadlift videos.
Discover Elitefts.com and ask questions there.
Every body is different, find your strongest/safest form.
Understand that one form, one motion, one concept doesn't work for everyone.
Find your form, the one your strongest in and go from there.
The road from 315 to 500, 500 to 800 isn't measured by days, it is measured in what you discover works for you and by applying it.