when i unrack the weight, i immidiately start flexing my lats as hard as i can. as i row the weight down i continue to flex my lats as hard as i can. the lower the bar gets the more of a bind i put the lats on. as the bar reaches my chest i'm bending the bar by forcing the meat of the outsides of my hands into the bar while flexing as hard as i can.
once the bar is at my chest, there's so much tension built up in my lats that the bar has no where to go but up. i actually have to limit the amount of lat tension i use or the bar won't reach my chest. it's not until about 405 that i can start really using all of that tension that builds up.