Anna's Hummingbird at Trailing Patunia

[Tom Callahan]

Canon 40D, 4 off camera flashes (420 EX) in softboxes, Canon ST-E2, ETTL, 1/250, F/16, Canon 400mm 5.6 lens, aperture priority, ISO 100. Shot in the shade.
I have a question. I have been using the off camera flash for awhile with the hummers. I'll use 4 on the bird and one on the background. In this image the BG flash malfunctioned, but I liked it anyway. So, with the soft boxes I get great color saturation, but can't freeze the wings. With the flash and a diffuser, or without, I can freeze the wings, however the color isn't as nice and I get a lot of specular highlighting. Help? Thanks