it's true: the main issue with this one is that the limbs aren't bending evenly...you said you hadn't re-tillered it, i think? When you do, either flip it like Marc said, or just do the majority of your tillering off what is the upper limb in this picture. I'm no scientist, but i think if the limbs bend drastically differently like in this photo, the result will be that the arrow lurches off the string, rather than flying off of it.
But about the sinew: how did you enjoy doing that? Did you bend the bow into reflex when sinewing it? Do you have enough for another course of sinew? If you do, you could even out the bend on those two limbs, string it backward to a low brace height (3 or 4 inches) and then apply that next course.
That is something i've only read about, however: sinew-backing bows is still on my to-do list.
cheers