Similar to a spin, its important to think about the flip first, then the grab, then the tweak, then the landing.
Set your flip up like a tuck, only with more rotation then you need, because you will slow down in the air.
As soon as you tuck, go for the grab as quickly as possible. You want to be tucked and grabbing before the first quarter of your rotation is complete. Once you’ve gotten the grab, arch your back as much as possible. This turns your backflip into a laid out backflip and slows down your rotation a lot, which is why you need to set up with more rotation than you needed.
After you arched your back, you’ll be able to spot your landing really quickly. Once your feet pass the top of your rotation, its time to get ready to land. Look, then stomp the landing.