You haven't finished your 3's yet! Carve your three's not using a hand. Ollie oop three (I don't consider these separate tricks - but add the three grabs up at the nose with your leading hand), stall your three at 180 and glide backwards a second or two and finally a bottom turn into a carving three. THEN do all those backside switch.
I have 2 trick videos I am just finishing that I did with Sean Cummings. One is for a backside 180 to switch, and the other is the 180 shuvit. The first is very easy to practice and learn, the shuvit is more difficult. Even when you practice the shuvit with the rope, you still crash, crash, crash. Which also makes it that much more rewarding to land.
Carve your three's not using a hand. Ollie oop three (I don't consider these separate tricks - but add the three grabs up at the nose with your leading hand), stall your three at 180 and glide backwards a second or two and finally a bottom turn into a carving three. THEN do all those backside switch. 
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