Here's an instructional to the trick that I posted before a while, hope it helps:
Just keep a few things in mind when trying Tantrums: Speed is live! Try to get a lot of air!!! If you don't get the right pop, the crashes can get pretty brutal. Do not take off too early! You'll jump flat and crash badly. Allright, let's go then. Cut out as wide as you can on your toeside (it helps when you cut out hard to get outside further). Wait for like one second and concentrate on your cut towards the wake while you slowly put your board on the heelside edge. Take a slightly seated position as you're starting your cut. Bend your knees further into a fully seated position during your cut. Cut in agressively digging your heelside edge in really deep for building LOTS of speed towards the wake. As you reach the wake, let off your edge, square up your shoulders and look towards the shore you came from (practice this many times without the final takeoff before you actually try the trick - just to get a better feel for the right timing). Let the momentum carry you up the wake. Let go with your back hand and put your lead hand with the handle somewhere near your lead shoulder. At the top of the wake, STRAIGHTEN YOUR LEGS to get maximum pop. Don't rush the takeoff! This, along with a good amount of speed, is key to achieve this trick! You want to jump up, not out! As you take off, tilt your head slightly backwards towards the shore you're heading. If you time all this correctly (sounds more complicated than it actually is), you should receive the pop you'll need to come all the way around on the flip. You don't have to worry too much about the rotation, it happens naturally when you set the right cut and take off correctly. The wake will just kick you up in the air and over, and gravity will let the board fall under you for the landing. Landing is the easier part of the trick. I can even close my eyes at the takeoff and feel the landing. It's a good idea to visualize the trick by watching instructionals like "Waketricks" or "The Book". It helps to have a big wake when learning this trick, it will make it so much easier.
And again, don't rush the take off! Take off from the top of the wake. Good luck