RE: Avionnette HM-8 build thread.
I've read somewhere about their flying problems but the article was in french...
As I understood it, the problems where related to the leading edge (or other parts of the wing or the wing profile). In the original drawings this is rather sharp and that would limit the angle of attach. With a correct profile I can't see why it would fly well with no diheadral and ailerons.
There's also an ARF made by Hacker with plenty of diheadral and somehow it doesn't look that good...