Yup - the 595 at the meet a few weeks ago did too. I haven't touched 600 since my pretty quick 635 back in early August at WFAC.
But despite moving pretty fast and not grinding at all, that knocked me on my ass for like 2 weeks. I've finally realized, slow as I am about my own body, that because of my longstanding back issues, the DL, specifically, needs a different approach than my other lifts and what I've done in the past. I could hit that 635 with 1-2 reps in the tank, but because my back and hips were unused to pushing against heavy weights, it messed them up for 2+ weeks. I've utilized heavy but submax 1s, 2s, and 3s in my training for years now, but I'm really focusing on a linear re-LP of heavy singles in the DL, to steadily re-adjust to the demands of heavy pulls. I've been strong enough at several points in the past to be within striking distance of 700, so most of this is really just re-adapting and re-sensitizing myself to the demands of it, more than actually building new strength i've never had. The LP of heavy singles, while steadily adding volume work to build the little bit I need, hopefully will put me in the spot I need to be in in 10 weeks.