Bucking

When I powershift my car. Shifting without letting off the gas my car will hesitate and then start bucking. Anyone have any suggestions? Its only when i do that. I wanna get good at it so I can get my track times lower if I can. Let me know what you think. Thanks alot for your help.
When I shift it it is well below the rev limiter, so thats not the problem.
 
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