So this is more wanting confirmation for my reading of things, than exactly a question. As I read it, Full Throttle on the TIE Defender no longer cares about Asteroids.
* " Full Throttle : After you fully execute a speed 3-5 maneuver, you may perform an [evade] action."
* "A ship Fully executes a maneuver if it does not overlap a ship. [Overlap, p.14]"
This is utterly agnostic with regards to obstacles. Whether or not you fly over an obstacle does not effect fully executing. Debris Clouds will still be important, since they provide a stress preventing you from taking an Evade action, but Asteroids don't seem to impact the ship ability.