Replying to 540s and spinning smoother

this has pissed me off all season. i wan't to land a 5 and a smooth 3. i can do 360s but it has to be a big jump and it pissing me off im hucking hard to what do think im doing wrong? i can land a 540 on the flat ground no sweat but when i strap on skis i cant even do it off a jump and my 3's aren't that smooth and i cant get a grab in so does anyone have any tips on spinning better? i want to land a 5 by the end of the season.