Hi Justin,
Ok, for sailing backwinded, you have your front foot just in front of the mast foot and hold the sail to the back to be able to keep the board on track.
When you want to do a Backwind Jibe, you need to steer the board downwind. When the board turns downwind, the pressure in the sail in creases and once you let the clew go through the wind, the pressure will increase instantly and probably pull you off the board. Also, if you don't step back, you'll have your body too far forward anyway, too much weight on the nose (it might even sink),...
So sail backwinded and when you're ready to backwind jibe, start by stepping a bit further back with the back foot, followed by stepping back, behind the mast foot, with the front foot. This alone might already let the board turn downwind (the tail sinks slightly, which makes the turning of the board even easier).
As soon as you stepped back, extend your mast arm upwind and keep the sail close to your body with the sail arm - this gives you room to open the clew farther and release pressure once the clew is through the wind.
In the upwind 360 it's quite the same,... the timing might differ a bit depending on the wind strength also - if the wind is very very light, you can step back later, while if the wind is a bit stronger, you better step back earlier and farther, to be able to lean your body against the upcoming pressure (once the clew is through the wind).
Important is, that you step back a bit from the normal backwinded position - and that you keep the sail relatively close to your body!
Just seeing the clips on the DVD - non planing Backwind Jibe, around second 38 - Laure has a pretty big board for her body weight, so she can step back easier and earlier... also see how close she has the sail to her body once she starts to steer downwind!
The first non planing Backwind Jibe is by Jakub, who has a pretty small board for his body weight, so he can't just step around how he wants on his board...
Try it and in case you have further questions let me know!
Have fun and good winds!
Rossi