Anhedral stab would be cool, you know the Japanese are experimenting with that one the Astral XX's. I think there are -3,-5, and -8 degree variations.

What motor would you be running on that? Since you are reducing the drag on it, you might not need an enigne as big as a 1.40 to work. But then again, you are also reducing some lift, so you would need a strong engine. Do you not like Mark's idea of having the mains sit a little lower? That is a viable solution, albeit different looking. Maybe try running a 3 or 4 blade prop?