Replying to couple spin questions

right now i can do 3s pretty smoothily off big kickers. i haven't really tried 5s, but this thursday night i'll be at Avila and i figure it's time to give it a shot. are there any tricks to get that extra 180 around? i don't really know how to go about it. also, landing switch tips, i acn do 180s to, but you know...

also, let's say i'm spinning left, when i go for the cross i want my left ski crossing over my right ski, right?

sometimes when i hit jumps, i go way right in the air, why?