I would say keep hucking it, but yes there is more to it. Make sure you aren't throwing them sketchy, so make sure your backflips are clean as a whistle. Try doing cork sets, like 3s to your back. When you wind up to huck stay coordinated and get lots of pop. Be able to spot your landing and stomp it.
More tips:
TUCK
Make sure not to huck too hard or you will probably land on your side or back.
Make sure your wind up coordinated.
Try to float them on bigger tramps if you are sure you aren't going to land on your head.
It might also help to reach for a safety.
Take a video of yourself and see if you are going to flippy or spinny, then correct.
My first cork 7 on a tramp was just a few weeks after my first backflip, and I didn't really know what I was doing until I filmed myself, video review is important. Once you have the rotation they are pretty easy, but it I still slip out when I land if i have soft socks on.
Hope this helped