This is a good pattern...but I'm also going to suggest that you try swapping out the CDC with snowshoe rabbit foot fibers. (cut the wing shorter). It will refloat after one or two false casts, unlike CDC. It's my go to BWO pattern....I also tie it as an emerger, with the tail being a few sparse fibers of olive antron or Z-lon. If you tie them small (22-26) just use olive thread for the body.