advanced snowboarding technique

In advanced intermediate snowboard question?
I went to the TIM first season yesterday, and was the first time with my new board I have during the summer. Burton is a patch of 149, have a very attractive price ($ 189). It was great, except when I started beating faster speeds. I begin to "bounce" on my desk, and was mostly in the heel, so you might have some technical questions I have. I wondered if there was anything he could do to help resolve this problem because it is very uncomfortable.
Pretty sure it's a park board, so if you go high speed, vibration, receiving the Board's so sweet. This is not the case because it is a Burton. I think there is much you can do In this sense, they also reduce their speed, but you can try adjusting your position (more wide) and bend your knees more. I do not know if you are helpful, but it seems to help me make a "small" when I was riding my skateboard park more speeds.

