That is a good cork!
My tip if you want to swing is to:
1. make a cork that you can overtwist by just holding the tuck
2. open up when you have done almost a full twist and land on one leg
3. find the right balance that allows you to swing the leg without bending it too much or falling too much to either side
Also if you just do a bunch of corks you will get better and swinging them will be easy