Dynamic Effort and bar flying off back
I have started the TSFOB off-season program from Practical Programming for Strength programming, and just did my first dyanmic effort squat set (in a while). I did it while I was doing intermediate programming with no real issues. However, now 60% of my 1RM (505) which is aroud 305lbs causes the bar to fly off my back, sometimes by two or three inches, if I go as fast as possible. I assume this isn't supposed to happen? Do I just keep adding weight until it doesn't do that, go up to 65%-ish?