Heya man, here's my take on it.... and I'm right where you are: landing them, but inconsistently.
I'm trying to keep the following in mind when I attempt them -- this should be one fluid motion, not two tricks crammed together. Get enough power from your weak leg by thinking that your crossover touch should be at the very top of your jump, because trying to execute the cross "on the way down" is probably impossible. Bend your weak knee enough to get sufficient elevation off the ground to do a solid, deliberate crossover, not some weak-ass touch as you struggle to not fall over. The accuracy of your first (atw) touch is also critical, as the ball's position when you get to the crossover phase of the trick will determine if you hit it correctly, if at all. Make sure the ball goes straight up on the atw and not to the sides and focus on a deliberate, controlled second touch at the apex of your jump. And your weight shifts from weak-leg to strong.
With all due respect to those who parrot the weak-ass "advice" of "keep practicing," that's NOT what this kid's asking for. Practice is a GIVEN, and reducing your input to "practice" is, while encouraging and well-intended, aggravating and no real help at all. I know this has been bitched about before, but I felt like it deserved another mention.
Good luck, dude... I'm getting better at TATW every day. I know you will, too!