Ringlee, did you strip the Rhea entirely off the stem into individual fibers or did you have them still attached on a thinner strip of the stem? If they were individual fibers, is there a good way to wrap them uniformly like you did?
You can on some feathers grab a few strands of rhea and pull down towards the bottom of the feather and they will stay attached leaving a thin strip of the stem on. This is how I tied those larger spey flies. If it dosen't work then you can grab 4 pieces and tie them in on each side. Then rotate your vise and tie on another "side" of the fly.