I have this exact problem, i used to think i was just horrible at it. When i changed from a Lib (C2) to a berzerker (slight camber) i found i instantly got better at skating and doing a green run with one foot out.
I am still not awesome at it, in fact my confidence is shit when i have to be aggressive with one foot in (i.e avoid a newb trying to take me out). BUT i found the board type made a big difference for my lack of skill.
I wish i could get better at it though!
my names's Petey and i have gigantic balls