Make sure your foot on the brake is completely planted - ie all the way to the floor - before depressing the throttle.
I noticed the first time I tried LC in my R that it did the same thing - turned out I only had my foot lightly on the brake. The technique I have used since is:
1. Come to a complete stop.
2. Put foot to floor on brake pedal.
3. Turn off ESP.
4. Transmission into S.
5. Floor throttle, revs jump to launch point.
6. Release brake quickly.
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