its hard to say what you are doing wrong without actually seeing a video of you trying the trick.
for the most part, your approach for the corked back 5 is going to be the same as when you do a regular back 5. when you pop off the jump instead of trying to spot the landing by looking over your back shoulder and keeping your upper body parallel to the ground you want to throw your front shoulder down more towards your back foot and try looking for your landing under your arm. if done right the first part of your spin should put you almost inverted and you just wanna keep looking under your arm still you see the landing pop up and just focus on that.
as for switch back, the hardest part for me when i learned them was just getting over the awkward approach. once i was able to comfortably approach and hit a jump switch, spinning switch back was just a matter of doing it more
Last edited by Cr0_Reps_Smit; 10-13-2011 at 07:44 PM.