Re: Prefold experts ;)
I wouldn't consider myself an expert because I'm always learning new ways to fold but I don't normally have a gap in the crotch. I do the reverse angel wing and jelly roll on my toddler and they both work beautifully.
The other thing you might want to try is to pull one side tight, Snappi, and then pull the fabric up in the middle and over to the other side tucking it in as you go and then Snappi the other side. It's hard to explain without showing you but the more you tweak and learn the easier it gets. Pretty soon you'll have a snug little booty. There's is nothing cuter than a prefold butt IMO.
~ Emily ~ loving my fireman, mama to a big bub, a sissy, and a little bub