Awesome trick, it's one of my stock tricks I pull off whatever, and one I see people struggle with alot. The common problem is that people have gone blind into the rotation and as soon as they come around and see the landing they prepare to land. But at this stage you'll have probably gotten around about 270 and as they have stopped rotating the head and upper body the lower body tends to stall in the air. So as you guessed you need to commit, my friend taught me a cool trick which isn't really endorsed by the associations but it worked for me and others, and that is to point your belly button towards where you want to be. This keeps your upper body moving and is what pulls you through the rotation. This is especially important if bs is your weaker direction for spinning.
It sounds cliche but a large majority of freestyle is commitment, keeping that upper body moving past the point where you've gotten yourself comfortable in the past.
Hopefully I've made some sense. I'm terrible at explaining things through writing.