well I think you might shy away from doing deads from the floor. I made a lot of progress by only pulling from the floor one time every three or four weeks. Rotate good mornings, defecit deads and rack pulls, and mix in bands and chains when pulling from the floor. Pulling less took me from high 500s to low 700s in short order.
week one good mornings
Week two defecit dl
week three rach pulls or block pulls
week four good morning variation again.
Additionally you need to find your weaknesses. And adjust your technique.
Tight lower back arch
pushing abs out against belt
Holding tight air
Pulling slack out of the bar
Possible muscular weaknesses
Ab strength, can never have abs that are too strong do heavy ab work sets of ten reps or less with heavy resistance.
erectors (lower back) hit this with either reverse hypers or weighted hyper extensions.
glute and ham strength, can be an issue as well. I like glute and ham raises, romanian dl, or stiff leg dl.
Currently I use a westside style of training.
I do a dl type exercise after squatting on max effort day
then I do a dynamic day with bands three days later.
Speed/dynamic days can be used to work technique as well as speed without overloading yourself.