It's easier with a bit more height but add them to your cork 7's and other single flips first. Then add it to the dub 10 set, and lastly just keep on trying those grabs in the dub 10.
A wider stance in your takeoff would help a lot here. Your legs are almost together on your set. It's hard to generate enough power to get different grabs with narrow take off. remember this "BIG on the set, Small in the air, Big on the landing" That will help you take it snow too. Another thing is do your dob 10 progressions with the grab you want on the full thing. Good luck!