You just didn't commit, as others said. Visualize a post about 10-15 feet to the left of you, and just kick your right leg up at it. As you kick your right leg across your body and up, keep your head looking straight forward. This will start the rotation, then you just pull it around. This is how I visualize mine, at least.
And I envy you. Learning new tricks with a snowmobile pull in onto a pow landing.