Guys, I had my CDV removed last night. My tech asked if I wanted him to remove it and I told him it doesn't have it or if it does it's a dummy like what everyone else around here says. Well guess what? My car had a CDV and he showed me the part after he removed it. There's a pinhole in the center not a pass through like everyone is saying. After he took it out I felt a difference right away.
Also to the OP, the weighted ZHP knob helped a little with the notchiness.