John Smith 2015

Have had a Pro sled with Klassen vest for a few months now. I have balanced it etc. and the moving shots are ok. But the problem is when I have to stop and hold a still frame. The sled gets a little too jittery, even if I take my hand off the Gimbal. I have done the dynamic balance and have a 2 second drop time. Any suggestions, ideas, exercises to help stop the jitters would be greatly appreciated by this newbie.