Hi Denco. On my A-10C profile I made, I set airbrakes to toggles 5 and 6. It works fine there, and if I want it open full I hold down the toggle 6. I can stop it at any time to open it partway by holding it down for less time, or even closing it somewhat with toggle 5.
I think I know the profile you were using with the precision slider, but I really hate it in that position because if you forget to push the slider back to the middle position, your joystick won't let you use any other buttons (like the ever important wheel brakes for instance).
By the way to delete extra bands there is an edit bands. To the left are some icons that allow you to set it back to one band, then you can add what you need.