Deadlift test

So, tonight was a max effort night.  I'll have one more before now and the meet so I wanted to get a light gauge of where I'm at.  at 500 pounds I pulled it off the floor great, but I lost my grip with my left hand.  Knew it wasn't a weight issue so I went and pulled again.  Once again, popped off the floor nice but I lost it with my left hand.  So, was pissed off at this point.  Chalked up hard, grabbed the bar as tight as I could and popped it off the ground and locked it out easy.  Then I went to 550.  Asked a friend to watch and see how fast it comes off the floor.  Told him there's no way I'm going to lock it out after those 3 pulls before I could hang on to 500.  He watched, popped it off the floor, once it hit my knees I was like "Yeah, I've got this."  Finished it.  Was pleased.  One more test day 3 weeks out I'll shoot for 575-580 on that test.  Just try to figure out what happened with my grip tonight.  At any rate, a little more grip work is on the table.  Wednesday we get to test the bench.  So that will be pretty fun.  My back is feeling pretty good from tonight so hopefully that'll hold up.  Anyway, no rants/tangents tonight, not sure how I'm feeling.