Can you explain, "the only prob. that i am having is the right side chain is rubbing the side of the tread, there is no way to move it back as it is a fixed rear mount"? Are you saying your bike chain is rubbing your tire? If this is the case I am wondering did you use the supplied spindle for the cranks? My other suggestion would be to remove some links from the bike chain to increase the tension. Since you no longer have to worry about the chain being able to use the larger and smaller front chainring you can get rid of some of the links. I think I took 4 out of mine.
Also curious what problems you were having with the twist shift and rapid fire? I have a twist shift and I love it.