I am not a fan of "doubling up" blocking units because it often helps to spread them out on opposite sides. For instance, it is okay if the assassin does not have frontal protection. If she were left one space, it would make stopping that flank attack that much easier.

The near side is kind of open. If your opponent can pressure with two knights, you may be in a little bit of trouble if you want to save everything (it is doable though, you have set up well) but the knight will be in your grill after that, and the bw loses usefulness. Perhaps you could put your scout there.

Or the assassin would work well in that hole also.

Assasin there would be killed easily by witch LW(21 26=47, or 35 12). Still, a knight there is just way, way to deadly.