it helps to concentrate on your kicking leg.... if you go CCW it would be your left... kick that upwards when on your back and transition out to the side as you enter into your link... one leg at a time... so you get the hang of controlling momentum... if you try to force it too much you'll end up losing control
if your problem is flexibility, then stretch. if you know you're flexible enough, then its a matter of forcing your legs to stay apart. there are a lot of technicalities, and ktownfarmboy has mentioned, about making sure you kick this and make sure you sweep that, but when it comes down to it, you simply need to FORCE your legs to stay apart
