doctor.deadlift- 3rd and last single of 900lbs

doctor.deadlift- 3rd and last single of 900lbs off a 2in block. AND... with a stiff bar lol. Was wanting to go for a bigger pull but my knees are still bugging me pretty bad with the heavier weights. Training has been rough the last month or so. And being sick last week didn't help much. But it's all starting to get a little better each time.