Roy, check your histogram on the yellows - you've got a big spike on the right side and it's got to be them. Try pulling the luminance (in Camera Raw) or the lightness (hue/saturation in PS) to soften them a bit.
Comp-wise I'd take a little off the top - the image feels bottom heavy as it is presented here since there is nothing in the top of the image at all. I like the wing spread shown here - nice freeze of the action, too. A slight step to the left might have shown that back wing a bit better but then I realize you couldn't predict what angle he was going to come in at!
Nice shot - like the angle of of the oriole. For me, only thing that detracts is that the perch looks sharper than the bird. Perhaps a bit more selective sharpening will do the trick
Hi Roy, nice bird and really nice setup. Agree with the comments above. Before I read them my first thought was the space at the top with everything happening more or less in the lower half. This is not helped by the uniform BG. Some blotchiness introduced into the top BG might counteract this.