https://www.instagram.com/p/8Woy3TN0sP/?taken-by=jsneagle&hl=en
That was about a year ago. I'm pretty bad at jumping on trampolines. I'm not sure if I have any shot of 12s to snow, but I'll look.
This video is super helpful. The first thing I notice right away is that you are very early in your takeoff and arm set; probably the single most common thing I see with any trick and most likely the reason why you spin to 12, rather than 10. The slow motion really helps to identify this. Notice how your arms and upper body begin to spin before your feet even leave the trampoline. The arm set and shoulder drop should be happening closer to the apex of your jump.
A few things to keep in mind....
When we are doing bigger tricks like dubs, our brain tells us that we need to jump higher, throw harder, and spin faster. While there is some truth to this, it isn't the whole story. What you are doing when you set early is inadvertently compromising your amplitude. Remember, every trick starts with a jump. You need to jump first and spin second. In this video, I see that you are trying to spin before you have even left the ground. I'd really like to see a video of a cork 7, as well as a flat 3, being that these are the building blocks for a dub 10.
Your trick usually ends the way it started. What I mean by this is that, if you "sling" yourself into a trick, you most likely will not have the control to stop the trick as you prepare to land. Think of people over-rotating backflips; if they are in the backseat as they sling themselves at takeoff, they most likely will land in the backseat because they lack the control to stop the flip. Remember, jump first, flip second. This is what allows us to spot our landing, slow our rotation, and stomp. If you are early when you set your dub 10, you will most likely lack the control to stop the spin at 10 and will continue spinning to 12 accidentally.
Hope that helps a bit. Please let me know your thoughts.