Form is so important on the overhead press. That was reinforced for me last night. I did 2x5 at 120 but the 5th rep of that second set was REALLY hard. I was pretty sure I would not get 5 on the 3rd set. However, on the 4th rep of that 3rd set I think I lucked into near perfect form and the bar nearly floated up. The rep took nothing out of me and I was able to get that 5th rep, although not nearly as easily. It was a nice reminder that I'm supposed to be focusing on form on those warm-up sets instead or rushing through them to get to the "real" work.