Im weak off the floor, really havent hit deficits as much as i was doing. need to start doing those more again. i have crappy bars for DL, so most of the time 75-85% feels like im lifting at 100%.
Well, not sure what "crappy" bars are for DL's. I use a pretty stiff bar (not a DL bar, which can be bendy) myself and even then, if you pull from the pins in a rack, the start is even harder and trains the start well, since you get no bar flex, if that is what you are meaning!?
Toro has thrown out a few good points too.
But most of my back work is heavy rows.
Well, a row is not training the lower back, hams and leg muscles especially like a conventional or even a sumo would, so to try to gain DL power with rows, I can say (at least for my own self) it will not get me a heavy pull.
You are only going to be as strong as your weakest link. If that is the start, or your pos chain, you gotta put some work in to beef/strengthen it up some.
Bottom line, as I am not from the school of thought, to not train the dead to increase the dead like some are. I believe in heavy deadlifting at least once per week for low reps and multi sets and then perhaps a second lighter day for speeds, or even on your squat day, some other pos. chain assistances.
YMMV.
BTW, nice strong squatting in your log there too dude.