If you were to talk to Ed he would emphasize that the lead eyes are as critical to the pattern as is the pheasant tail. It is not just for the sink rate, but it provides much of the action. When the fly enters a soft patch of water the head of the fly sinks which increases the vortex action that Ed speaks of.
I have never been a fan of weighting steelhead flies, but Ed makes a convincing arguement and who can question his results? So I even gave lead eyes a try on my Voodoo Child, wouldn't you know it - 1st run, 10 cast - 15 lb screamer. I have not, nor am I likely to, put lead eyes on all my flies, but, for certain water-types - absolutely! It is now a part of my arsenal.
My suggestion would be to tie a few with