Woohoo! I don't really Know if anyone else has acomplished this on -30 Gravity, But I did it! (If you want a tutorial, Message me)

I did a G Backflip to G Double backflip When I STILL don't know how to cork on -30 Grav

Cool man ^-^

Thanks

Close, but your head hits the ground cx Good try though!

Lol double backflips were landed back in 2013.
But yeah, AlwaysGone is right. Perhaps if you stay tucked you might get more rotation and be able to land it.