It doesn't look like you are setting it hard enough. Really throw all your momentum up and back with your arms and then pull your legs up ASAP. Get somebody to double bounce you too. You simply need more height as well.
Here is a video of the first dub back I landed..
<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" width="480" height="340" codebase="http://fpdownload.macromedia.com/get/flashplayer/current/swflash.cab"><param name="movie" value="https://www.newschoolers.com/ext/jw_player/player-4.6.swf"><param name="autoplay" value="true"><param name="quality" value="high"><param name="allowScriptAccess" value="always"><param name="allowFullScreen" value="true"><param name="flashvars" value="file=http://media.nscdn.com/uploads/member/videos.264/1245294456_1245293123Dubs.mp4&link=https://www.newschoolers.com/web/content/viewvideo/id/275690/&config=http://media.nscdn.com/uploads/site/embed/v1nsjwembed.xml"><embed type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer" src="https://www.newschoolers.com/ext/jw_player/player-4.6.swf" width="480" height="340" bgcolor="000000" allowfullscreen="true" allowscriptaccess="always" flashvars="file=http://media.nscdn.com/uploads/member/videos.264/1245294456_1245293123Dubs.mp4&link=https://www.newschoolers.com/web/content/viewvideo/id/275690/&config=http://media.nscdn.com/uploads/site/embed/v1nsjwembed.xml" /></object><div style="font-family: arial, sans-serif; font-size: 10px;">Courtesy of <a href="https://www.newschoolers.com">Newschoolers.com</a></div>
