I've been improving my switch recently, and I find that I am leaning into the back seat a lot. On mellower pitches, it doesn't really affect my riding much, but then as soon as I hit something steeper, it kills me unless I actively balance my weight center (which feels like I'm hanging over a cliff..)
One other thing I can note is do drills where you only do heelside(or toeside) turns, which involves half switch and half normal, and changing the two with 180's. Toeside is fine for me, but the heelside is the hard one.
Semi related, but I find when I'm doing flatland 180's, I pop off an edge and generally land 170 or so on an edge. I can ride it out, but it doesn't feel/look clean. Any tips?