Mine flew apart at 450 rwhp. But I'm a stick. Look, just run it. It sounds like that's what you are leaning toward doing anyway.
Worry about a one piece when and if yours breaks.
How many auto failures would you need to find before you purchased a one piece?
You're going to get opinions on both sides. I personally put a set on and liked them. I felt the car rev quicker and had no negative side affects. I had the same mods as you.
Others will tell you they do nothing and to save your money for twin turbos or something.