RE: Aerobird Swift problems.
Greetings again. I mentioned the elevator up being needed. I proberbly took it for granted that our mexican colleague had set as per manual, elevator will probably need to be at max to get airborne off ground depending on wind conditions (as you mentioned - at neutral normally.). True there isn't a lot can be done for CoG but i use what you mentioned - battery far back. Packing under leading edge (if it can be done) can help maximise lift (some wings can be a slight loose fit anyway). Hope this clears up any confusion on my link. Thanks!!