That's what I have on it now. I've had it as high as 900 when I was breaking the disc in, and they come in from the outside to the center. Even at 900 it won't chatter.
I'm very careful with the plate load that low for just screwing off on the street because it's real easy to drive through the clutch if you're not careful.
I know guys running as high as 1500 base pressure on the street and they don't get chatter either. But that's a TON of load for the disc. You hit the car with bite and that much plate load and it will probably break parts.
I also use a little counter weight. I think is 8 grams on three levers, so 24 grams total. I also have some custom made fingers that actually delay the the counter weight a bit.
My pressure plate is adjustable so I can change the plate pressure easily.