in reality it was a slightly off axis over rotated 360. like others have said learn flat 360s first then for a back cork 540/ 720 think about dropping your front shoulder behind you like your grabbing your back foot with your right hand exept ALWAYS GRAB MUTE haha thats actually the trick to learning to cork spins grab mute and Huck down with your front shoulder. like honestly like a week ago when my buddy told me that I instantly could cork like mad haha, a corked 540 is still a 540 so you will land switch. think misty, if you know what that is, but actually put the spin into your front flip instead of after your flip. hence why front cork 5s are often confused with front rodeos and back mistys with back cork 5s
and a 720 is still a 720. a corked spin is actually less rotation than a flat spin but when doing double corks and such they count a complete flip a 360 aswell as extra spins to name the trick. seen in the video below he links a 360 with a cork full invert flip=720 with a full invert flip and 180 = 540 720+540=1260
I will try flat 360 this weekend and see how it goes. I was confused by this trick because I have done a cork 5 here : see video and it was easier because the kicker had more pop and threw the flip easier.
Also, on the last jump I think I grab mute and you are right, it really helps
Anyway, can't wait for the weekend to try them out