Good suggestions so far.

Do you do conventional deads, Ross? And are you sure your biggest problem is off the floor or could it be a few inches up?

I would have also suggested snatch grip deads..they can help the lift off as well....but with your shoulder issues I'm not gonna go there right now. There is probably no part of your body that deads DON'T affect and hell, yes, they can be a factor with your shoulder.

If I could see a vid of your deads I may be able to improve your postioning...could be a the difference in yanking it off the floor and stuggling...but in any case, as far myself..I have always felt stronger at lockout than the bottom.