The distance between the pads and straps
The longer your body length, the longer de distance between the pads and straps should be. Putting your bindings close to each other will make it more controllable and steerable, you will have a more playful experience. A wider distance between bindings will give more stability when you land a jump. It also makes it easier to handle a lot of power.
The angle of the bindings
When your bindings are more angled, where your toes are more pointed to the tips, you will be able to show some more maneuvers. Comfortable and general kitesurf riders who like to play around will like this more.
When you place your bindings parallel to each other, it will give you more stability, reduces the pressure on the knees, you can bear harder landings. As already said, if you like cruising around comfortably, this one might not be the setup for you.
Important: Keep the angle identical to the other!
Placing it more toe side or heel side?
It is normal to place the pads exactly in the middle. However, if you have smaller/bigger feet you might want to check how your foot fits in the binding. Check if the feet lies centered on the board when it is in the binding. If not? You could adjust to pad so that your feet is in the center of the board. You can choose to put the pad more toe side or heel side. Placing it more on the heel side will give you a better edge, it could improve jumps. But your balance will be less stable.