I ride a 157 and weigh 180. I find the proto has no speed stability for anything outside the park. It's great when you want skate the mountain going from hit to hit when the hits are close to each other, however if there is a long stretch between hits and you want to put the hammer down the proto quickly turns into a chatter box.
The proto is great with 390s, you can tweak grabs like a MFer.
Man, the Internet sounds like a tuff place to ride.