I cant even do wheelies, but I have poped up a few because I was trying to figure it out and I think you have the wrong technique. My buddy does the same thing, only it works cause hes on a gixxer 1000. He basically pulls in the clutch at any rpm, holds it for way to long, brings the rpms up to 11k, then dumps the clutch, and the bike jumps right up, totally unpredictable. I think (for whats its worth, I hope someone will back me up) you want to get the bike going at a certain rpm, probably around 6-8k im guessing, slip the clutch very very very quickly, basically pull the clutch in until it disconnects the drive and then let it back out, its all one fluid motion, you dont stop or hold the clutch in at all. As you are letting the lever back you out also wanna be giving it quick throttle, the quicker you twist the throttle the quicker the front end goes up. I may be totally wrong about your technique, but I just know there are people who do it like that (aka my friend) and I am not sure its a good technique, or very good for the clutch or tranny.