Yeah, that back flip was my favourite. You look really solid on rails and boxes too. I've only been riding for a month, but I'm already dreaming of being able to nail a board slide. They look soooo good!
Just keep getting good outside of the park. Widen out that stance and set your back foot angles between -9 and -15 then put your front foot angles at +9 and +15 (It will make your balance super centered on your board and will feel very natural to ride jibs).
The wide stance will make it tough to spin at first, but it will force you to understand and perfect the mechanics to spinning. The primary purpose is that it feels very very very balanced and easy to ride with, your board will feel like a toothpick.
Just keep practicing your out of park riding and then just 50-50 all the flat boxes in sight. Go on with a flat base then work your way up to slides, all you have to do is approach like a 50-50, but squat and kick your tail in front of you so that your board is sideways, but not your shoulders.
wish i had the balls to go for the back flip, even though i could do it without a board on... =P the speed is what scares me.
Yeah man, their my favorite tricks. practice into pow, the takeoff should be solid as a park jump and as you take off, you dump your hip over your tail so that it presses and flicks out from under you. Landing is really tough in pow, so If you can feel the takeoff super well, then that is all you need before you go into park. The lay'ed out ones that I do are super manipulative, if I feel as though I don't have enough speed, i have the availability to tuck my knees in so I can flip fast and get my rotation around before I smack on the knuckle (it still sucks none the less). Just practice a lot and only flip when the park is soft and slushy at first. Flipping on ice is scary and definetly dont reccomend it unless you absolutely understand the nature of the jump and the run in speed.