I'm no expert on the subject. I've only landed one. But I've tried 2350923752340972345097 of them. I just had the inconvience of a boat wake that provided little air and not enuff sac to hold onto the rope. Getting better, but screwed my knee up the day after I landed my first one. I've found out watchin a video over and over and getting the trick in your head real good helps. PIcture yourself doing it. Also, think of doing a reverse cartwheel in the air, which is kinda what it is. What I've read is...keep your elbows in and look to your trailin shoulder. The backflip you speak of is a tantrum. If all else fails, my friend snake has developed 3 steps to wakeboaring effectively:
1. Grab Handle
2. Bite lip.
3. Give hell.
Hope that helps some. I'm sure someone will come along and tell you that I'm all wrong. but hell..I tried. Good luck man, its a damn good feeling when you finally land one.