They are tied backward because this is how they escape danger, by swimming backward. The eyes I'm using are a bit big but that is what I have and I don't think it really matters. I use different colour and thicknesses of wire....again only personal taste. It doesn't matter whether one arm is bigger than the other because that is the way it is with most of the naturals but I know it would bug some fly tyers if they tried to get them even and it didn't work out that way, LOL
Because brookies are often found around logs and snags, always have a few extra. I had very good luck at Kenauk's Collins Lake this spring with these. I also lost quite a few to snags.