My humble observations:
It appears that you wait to huck the last 180 degrees until the very last second. Rather than simultaneously jumping/hucking and THEN spotting your landing, it's as if you jump, spot your landing, and THEN huck.
Look at your face throughout the jump. You're staring at your landing from the second you leave the lip, and though your body is rotating, your head is locked until the last second. Your head and shoulders should be the first body part to rotate, not the last. Lead with your head/face; the rest of your body will follow. You should spot your landing AFTER you've rotated the first 180 degrees.
Honestly, it looks like you're a little timid when it comes to committing to the blind landing. If you fully commit to the first 180 degrees from the start you won't have to huck so hard once you're in the air. This is probably why you're washing out; you still have a lot of rotational force after you land. Proper technique and timing will give you the control needed to stop the spin.
edit: YOU WILL BE LOOKING UPHILL WHEN YOU LAND, and this is what keeps you from rotating into a 540 (blind landing, similar to a BS180).
Can you FS3 on flatland? If not, it's only due to technique, bc its an easy trick. If you can stomp your 3's in the flats you'll have no trouble with jumps.
tldr: Rotate your head first, not last. Spot your landing after the first 180 degrees, not prior.
Last edited by rwspear; 01-10-2013 at 02:22 PM.