found this in my archives today. it's about 2 years old. nowadays I can do that with a lot more class and lot less noise on the Repsol

 

I think you need more throttle.

Youre a brave man for launching at that stuff with such high rpm, one slip of the clutch finger and your bike would be off to the moon. But as you say, at first we compensate for lack of technique with more throttle, then as we refine the technique we can reduce the throttle