And, why are the answers questions lol
If you look around the forum you will find lots of info. calf cuffs have been talked about in a couple of topics. It's a personal preference thing but could be good if you have small legs.
I don't think people can give advise on landing back flips. Maybe if they saw what you were doing they could give you some pointers but as yet, I don't think any kinda tutorial has been made and I think people learn by practicing until they get it right.
Which new stilts are you talking about? Projump elites? They will be released when the problems have them have been ironed out. At the moment they are not as good as they can be. Projump wont release any half baked loaves