Learning To Whip

 You look pretty good at pushing out your tail a bit, but to get your tail even further out you should when you reach the lip of jump turn, slightly, in the opposite direction of that you want to whip, in your case turn slightly left, that should automatically throw your tail out as soon as your in the air, then all you do push like you have been doing. Once reached the 'peak' of your whip, slightly lean diagonally right and 'pull' your bike back in (just like you 'pushed' it out, just opposite). Once comfortable with these series of movements, you will soon be chucking some huge whips! Good luck man!
PS, This is how I learnt

 holay... shwoin me up...