I think the main problem is that you believe that you can shed 5 lbs by moving from a steel frame to a different material. I think this is a fallacy. Steel touring frames weigh around 5-6 lbs (e.g. Surly LHT about 5.2 lbs). I don't know if anyone has ever attempted to make a true CF touring frame, but I gave an example of one that is at least capable of light touring, and it weighs 2.5 lbs. Aluminum touring frames again will not save you 5 lbs over a steel touring frame.