Keep the handle in closer to your front hip as you leave the wake. That very thing is what got me to be very consistent with this trick.
Do the first 180 on the way up but keep pulling the handle around to your back hip so you do the second 180 on the way down. You really don't have to rotate near as far as you think to land these so don't be freaking out about the handle pass right off the wake. I don't pass the handle until right as I'm landing. Doing a later handle pass will also keep you from slipping out on your heels. If the boat is 12 o'clock...then I'm looking at about 8 o'clock when I land. Do not worry about getting your head back around to the boat before you land.