Mine climbs if the elevator is at nuetral and as you found needs about 4 to 5 deg down to hold level. Don't try to land this too slow as it (mine) is heavily built so is not a floater. Some have written here about shimming under the rear bolts on the upper wing but I have not tried this. Please don't crash that incredible example again. It deserves some serious air time as you have put so much effort into it.

Chris