seriously go big your first attempts (as long as there's a little powder) and have a nice, steep lip. then just have enough speed to go big and throw it exactly like you would on a tramp. that's what i did in whistler 2 weeks ago and i stomped my first attempt.
I'd say your main problem is your being a pussy. You need to attack that shit. The key to the backflip is speed , fly at that bitch and keep commited and you'll land it. You will never ever land a back going that slow.Please Beleive me
just commit. Hips to the sky, bring in the knees. You could've probably landed the second one not on your head if you didnt give up. Also you dont want to lean back, you want to jump, throw your hips forward and look back.
i can't give u any advice on the backflip myself... but make a steeper landing and since ur attempting a flip make the lip higher so u can get more vertical and stay commited to the trick n' you'll have it... o and tuck ur legs more the second one looked painfull