what i do is set like 90 degrees of rotation off the jump, hold a garb, and then go the other 90 right before i land. usually a grab where you don't cross your skis. it doesn't look like a jerked spin when i do it though, looks smooth with the grab.
I like to carve into it a tiny bit. just enough so that, depending on how big the jump is, when you pop with that amount of carve you'll set just enough rotation. I also think that being on both left edges (while spinning left) feels a lot more solid on the pop so you're a lot more steady in the air. and usually it'll just come around when you look for the landing; kinda hard to explain but it feels real cool.
add a lil shifty and stagger the legs a bit while you're waiting for the landing and you're all poppin n ready for a big ol zero on the next hit--even more fun!
try go off almost like a zero spin but maybe angled a bit, and if its big enough you should be able to get it going in the air by turning your head near the beginning of the jump for just a 180 as long as its a bigger jump