Well, it's not really bouncing, it vibrates when the pipe touches the peg. I agree, it is annoying and I have ignored it a bit since I intend to do a 4-1 soon, thus the problem would be gone. You HAVE to adjust the set screw unless it is tight from the start. Like I said, my left peg was crazy tight, so no problem. You need to pull the peg off the bike. Remove the screw from that holds the peg to the body (how you would adjust movement), then look through the hole. You need a small allen wrench to turn this out. As in the previous, post, it will take some trial and error to get it out the right amount. If it is out too far, you can not get the pin back in the holds it to the bike. In too far, and it is loose. Mine came with a note on the package that stated on Hayabusas you MUST adjust these set screws.
Let me know how it works out.