For any Backside Kick, make sure you keep your arms open for the first 90 degrees of the spin and wrap them in as soon as your chest faces the target. That will keep you vertical and help with balance.
You can even learn this trick before you learn the normal Backside 1080, if you have a strong Backside 720 Turbo and a good Cheat or Pop 720 Double.
You spot three times with this trick. Before takeoff. After the first spin for the first kick and then while you fire the second kick. If you can’t quite make it to the last spot, try to jump higher, so you’ll have more time for the two spins.