I've been making great progress on my deadlift, but am starting to see a form issue appear. Below in the video you can see several of my heavy sets which show that I'm no longer able to keep a tight arch in my low back (I think partially b/c my upper back is rounding and pulling me). The rounding starts to occur at my work sets, my warmups are solid. I had a couple of thoughts on this, mind you the 367 is my "x3" set in 5/3/1 week and the 475 in this video is 65 lbs above my 1+ rep set on the 5/3/1 wk:
1 - drop training max down far enough so that i can focus on keeping the back flatter (I feel like it'd be a big step back - training max down by 70 or so pounds)
2 - my form isn't too incredibly horrible, so is it not too big of a deal to keep pushing forward?
3 - I seem to recall seeing somewhere that Wendler mentioned a couple of cases where people hit big deadlifts w/o ever having their training max real near what they pulled (like hit 550 with a TM of 450 or so), so, in addition to improving form, I could still get stronger by backing off right?
thanks for the support/ideas guys